Can't access config page

Are you attempting to go to admin/config/antispam you mean?

Do you have permission to administer the module? Have you tried clearing your cache?

The latest version, 7.x-1.5 has this menu item declaration:

  $items['admin/config/antispam'] = array(
    'title' => t('AntiSpam'),
    'description' => t('Use the anti-spam service to protect your site from spam.'),
    'page callback' => 'drupal_get_form',
    'page arguments' => array('antispam_settings_form'),
    'access arguments' => array('administer antispam settings'),
    'file' => 'antispam.admin.inc',
    'type' => MENU_LOCAL_TASK,
  );

The type should be MENU_NORMAL_ITEM, and you'll have to pick a subsection, or create your own. Something like development, metadata, or etc.

This is not an issue anymore in the -dev version, that path does not exist since this commit got in. Please test with the -dev version.