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Fatal error: Uncaught Error: Call to a member function getAllPrevious() on null in /opt/lampp/htdocs/myhospitalnow/mhn-file-management-ms/vendor/symfony/error-handler/Resources/views/exception.html.php:5 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/myhospitalnow/mhn-file-management-ms/vendor/symfony/error-handler/Resources/views/exception.html.php on line 5