Fatal error: Uncaught Error: Call to a member function getCode() on null in C:\xampp\htdocs\mediawiki\includes\user\User.php:1594 Stack trace: #0 C:\xampp\htdocs\mediawiki\includes\user\User.php(5272): User::getDefaultOptions() #1 C:\xampp\htdocs\mediawiki\includes\user\User.php(2884): User->loadOptions() #2 C:\xampp\htdocs\mediawiki\includes\context\RequestContext.php(364): User->getOption('language') #3 C:\xampp\htdocs\mediawiki\includes\Message.php(380): RequestContext->getLanguage() #4 C:\xampp\htdocs\mediawiki\includes\Message.php(1275): Message->getLanguage() #5 C:\xampp\htdocs\mediawiki\includes\Message.php(842): Message->fetchMessage() #6 C:\xampp\htdocs\mediawiki\includes\Message.php(934): Message->toString('text') #7 C:\xampp\htdocs\mediawiki\includes\exception\MWExceptionRenderer.php(200): Message->text() #8 C:\xampp\htdocs\mediawiki\includes\exception\MWExceptionRenderer.php(300): MWExceptionRenderer::msg('dberr-problems', 'Sorry! This sit...') #9 C:\xampp\htdocs\mediawiki\includes\exception\MWExceptionRendere in C:\xampp\htdocs\mediawiki\includes\user\User.php on line 1594