Assignment

i cant enable or disable crot. when I first install crot to moodle 2.5 then enable it. the plugin will not enable but in the database it already save the config. then i uninstall the plugin and install it again, now crot is enable. but when i disable it, i says successful and updated to database but when you go back to the settings, still it is enable. help to fix this bug. only local comparing works with moodle 2.5 thanks,,,