Getting a lot of "Trying to get property of non-object" errors

After install I'm getting a lot of errors:

Notice: Trying to get property of non-object in mothership_file_link() (line 23 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in theme_file_icon() (line 739 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 781 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_map() (line 823 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 36 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 43 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 23 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in theme_file_icon() (line 739 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 781 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_map() (line 823 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 36 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 43 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 23 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in theme_file_icon() (line 739 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 781 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_map() (line 823 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 36 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 43 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 23 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in theme_file_icon() (line 739 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 781 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_map() (line 823 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 36 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 43 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 23 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in theme_file_icon() (line 739 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 781 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_map() (line 823 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 36 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 43 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 23 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in theme_file_icon() (line 739 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 781 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_map() (line 823 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 36 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 43 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 23 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in theme_file_icon() (line 739 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 781 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_map() (line 823 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 36 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 43 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 23 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in theme_file_icon() (line 739 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 781 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_map() (line 823 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 36 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 43 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 23 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in theme_file_icon() (line 739 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 781 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_map() (line 823 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 36 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 43 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 23 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in theme_file_icon() (line 739 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 781 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_map() (line 823 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 36 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 43 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 23 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in theme_file_icon() (line 739 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 781 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_map() (line 823 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 36 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 43 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 23 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in theme_file_icon() (line 739 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 781 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_map() (line 823 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 36 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 43 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 23 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in theme_file_icon() (line 739 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 781 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_map() (line 823 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 36 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 43 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 23 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in theme_file_icon() (line 739 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 781 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_map() (line 823 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 36 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 43 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 23 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in theme_file_icon() (line 739 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 781 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_map() (line 823 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in file_icon_path() (line 796 of modules/file/file.module).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 30 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 36 of sites/all/themes/mothership/mothership/functions/icons.php).
Notice: Trying to get property of non-object in mothership_file_link() (line 43 of sites/all/themes/mothership/mothership/functions/icons.php