500 Internal Server Error

Call to a member function prepare() on null (0)

#0 /var/www/html/sites/prohaat/controllers/MovedPermanently.php(9): CM\Database\CSql->executeValue()
#1 /var/www/html/sites/prohaat/conf/config.php(22): MovedPermanently->moveIfFound()
#2 [internal function]: {closure:/var/www/html/sites/prohaat/conf/config.php:20}()
#3 /var/www/html/CM/Core/Dispatcher.php(138): call_user_func_array()
#4 /var/www/html/CM/Core/Dispatcher.php(129): CM\Core\Dispatcher->callFunction()
#5 /var/www/html/CM/Core/Dispatcher.php(52): CM\Core\Dispatcher->execute()
#6 /var/www/html/CM/Engine.php(119): CM\Core\Dispatcher->run()
#7 /var/www/html/CM/Engine.php(317): CM\Engine->__call()
#8 [internal function]: CM\Engine->_start()
#9 /var/www/html/CM/Core/Dispatcher.php(145): call_user_func_array()
#10 /var/www/html/CM/Core/Dispatcher.php(128): CM\Core\Dispatcher->invokeMethod()
#11 /var/www/html/CM/Core/Dispatcher.php(52): CM\Core\Dispatcher->execute()
#12 /var/www/html/CM/Engine.php(119): CM\Core\Dispatcher->run()
#13 /var/www/html/CM/CM.php(66): CM\Engine->__call()
#14 /var/www/html/sites/prohaat/index.php(9): CM::__callStatic()
#15 {main}