strange url when pretty plugin is activated. url when its

HI,

strange url when pretty plugin is activated.

url when its activated: wp-admin/admin.php?page=pretty-plugins.php&plugin=custom-favicon%2Fcustom-favicon.php&_error_nonce=723a6fdf64

regular plugin url when pretty plugin is deactivated: wp-admin/plugins.php?plugin_status=all&paged=1&s