API databases don't work. EX0 Error

[Get-Gaming]

Tue, 05 Jan 2016 20:34:32 +0000 (Severity: 2)
89.99.247.239 - https://get-gaming.net/admin/?adsess=gklr9sgd58q5eoar4es70ptj85&app=core&module=applications&controller=api&tab=apiReference&endpoint=cms/records/GETindex
ReflectionException
0: Class \IPS\cms\Category does not exist
#0 /var/www/vhosts/get-gaming.net/httpdocs/applications/core/modules/admin/applications/apiReference.php(154): ReflectionMethod->__construct('\\IPS\\cms\\Catego...', 'apiOutput')
#1 /var/www/vhosts/get-gaming.net/httpdocs/applications/core/modules/admin/applications/apiReference.php(169): IPS\core\modules\admin\applications\_apiReference->_getAdditionalClasses('\\IPS\\cms\\Catego...')
#2 /var/www/vhosts/get-gaming.net/httpdocs/applications/core/modules/admin/applications/apiReference.php(100): IPS\core\modules\admin\applications\_apiReference->_getAdditionalClasses('IPS\\cms\\Records')
#3 /var/www/vhosts/get-gaming.net/httpdocs/system/Dispatcher/Controller.php(94): IPS\core\modules\admin\applications\_apiReference->manage()
#4 /var/www/vhosts/get-gaming.net/httpdocs/applications/core/modules/admin/applications/apiReference.php(34): IPS\Dispatcher\_Controller->execute()
#5 /var/www/vhosts/get-gaming.net/httpdocs/applications/core/modules/admin/applications/api.php(86): IPS\core\modules\admin\applications\_apiReference->execute()
#6 /var/www/vhosts/get-gaming.net/httpdocs/system/Dispatcher/Controller.php(94): IPS\core\modules\admin\applications\_api->__call('manage', Array)
#7 /var/www/vhosts/get-gaming.net/httpdocs/system/Dispatcher/Controller.php(94): IPS\core\modules\admin\applications\api->manage()
#8 /var/www/vhosts/get-gaming.net/httpdocs/system/Dispatcher/Dispatcher.php(129): IPS\Dispatcher\_Controller->execute()
#9 /var/www/vhosts/get-gaming.net/httpdocs/admin/index.php(13): IPS\_Dispatcher->run()
#10 {main}
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[Jim M]

Please go to your client area and donload a full batch of files and upload these to your server, overwriting what is there.