Fatal error: Uncaught TypeError: Symfony\Component\HttpFoundation\InputBag::get(): Argument #1 ($key) must be of type string, null given, called in C:\xampp\htdocs\journal\lib\pkp\lib\vendor\laravel\framework\src\Illuminate\Session\Middleware\StartSession.php on line 160 and defined in C:\xampp\htdocs\journal\lib\pkp\lib\vendor\symfony\http-foundation\InputBag.php:29 Stack trace: #0 C:\xampp\htdocs\journal\lib\pkp\lib\vendor\laravel\framework\src\Illuminate\Session\Middleware\StartSession.php(160): Symfony\Component\HttpFoundation\InputBag->get(NULL) #1 C:\xampp\htdocs\journal\lib\pkp\lib\vendor\laravel\framework\src\Illuminate\Support\helpers.php(399): Illuminate\Session\Middleware\StartSession->Illuminate\Session\Middleware\{closure}(Object(Illuminate\Session\Store)) #2 C:\xampp\htdocs\journal\lib\pkp\lib\vendor\laravel\framework\src\Illuminate\Session\Middleware\StartSession.php(159): tap(Object(Illuminate\Session\Store), Object(Closure)) #3 C:\xampp\htdocs\journal\lib\pkp\lib\vendor\laravel\framework\src\Illuminate\Session\Middleware\StartSession.php(57): Illuminate\Session\Middleware\StartSession->getSession(Object(Illuminate\Http\Request)) #4 C:\xampp\htdocs\journal\lib\pkp\lib\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(209): Illuminate\Session\Middleware\StartSession->handle(Object(Illuminate\Http\Request), Object(Closure)) #5 C:\xampp\htdocs\journal\lib\pkp\classes\middleware\PKPEncryptCookies.php(44): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request)) #6 C:\xampp\htdocs\journal\lib\pkp\lib\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(209): PKP\middleware\PKPEncryptCookies->handle(Object(Illuminate\Http\Request), Object(Closure)) #7 C:\xampp\htdocs\journal\lib\pkp\lib\vendor\laravel\framework\src\Illuminate\Pipeline\Pipeline.php(127): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request)) #8 C:\xampp\htdocs\journal\lib\pkp\classes\core\Dispatcher.php(179): Illuminate\Pipeline\Pipeline->then(Object(Closure)) #9 C:\xampp\htdocs\journal\lib\pkp\classes\core\Dispatcher.php(114): PKP\core\Dispatcher->initSession() #10 C:\xampp\htdocs\journal\lib\pkp\classes\core\PKPApplication.php(426): PKP\core\Dispatcher->dispatch(Object(APP\core\Request)) #11 C:\xampp\htdocs\journal\index.php(21): PKP\core\PKPApplication->execute() #12 {main} thrown in C:\xampp\htdocs\journal\lib\pkp\lib\vendor\symfony\http-foundation\InputBag.php on line 29