500 Internal Server Error

Non-static method ItemController::_renderItem() cannot be called statically (0)

#0 [internal function]: ItemController::viewItemForPermalink()
#1 /var/www/html/CM/Core/Dispatcher.php(146): call_user_func_array()
#2 /var/www/html/CM/Core/Dispatcher.php(126): CM\Core\Dispatcher->invokeMethod()
#3 /var/www/html/CM/Net/Router.php(114): CM\Core\Dispatcher->execute()
#4 /var/www/html/CM/Engine.php(315): CM\Net\Router->route()
#5 [internal function]: CM\Engine->_start()
#6 /var/www/html/CM/Core/Dispatcher.php(143): call_user_func_array()
#7 /var/www/html/CM/Core/Dispatcher.php(126): CM\Core\Dispatcher->invokeMethod()
#8 /var/www/html/CM/Core/Dispatcher.php(52): CM\Core\Dispatcher->execute()
#9 /var/www/html/CM/Engine.php(119): CM\Core\Dispatcher->run()
#10 /var/www/html/CM/CM.php(66): CM\Engine->__call()
#11 /var/www/html/ukmuovi/index.php(6): CM::__callStatic()
#12 {main}