Fatal error: Uncaught Error: Call to a member function prepare() on null in C:\inetpub\webroot\gvsetsdocs\include\common\commonFunctions.php:45 Stack trace: #0 C:\inetpub\webroot\gvsetsdocs\publication.php(10): checkExists() #1 {main} thrown in C:\inetpub\webroot\gvsetsdocs\include\common\commonFunctions.php on line 45