path errormessages

I get this error messages. What's the matter and how can I solve this problem?

•warning: file_exists() [function.file-exists]: open_basedir restriction in effect. File(/descript.ion) is not within the allowed path(s): (/nas:/instances/home/n/var/lib/php/tmp) in /nas/[username]/sites/all/modules/filebrowser/filebrowser.module on line 243.
•warning: file_exists() [function.file-exists]: open_basedir restriction in effect. File(/file_name.bbs) is not within the allowed path(s): (/nas:/instances/home/n/var/lib/php/tmp) in /nas/[username]/sites/all/modules/filebrowser/filebrowser.module on line 245.
•warning: is_readable() [function.is-readable]: open_basedir restriction in effect. File(/file_name.bbs) is not within the allowed path(s): (/nas:/instances/home/n/var/lib/php/tmp) in /nas/[username]/sites/all/modules/filebrowser/filebrowser.module on line 854.
•warning: is_dir() [function.is-dir]: open_basedir restriction in effect. File(/) is not within the allowed path(s): (/nas:/instances/home/n/var/lib/php/tmp) in /nas/[username]/sites/all/modules/filebrowser/filebrowser.module on line 258.