Trouble upgrading OJS 3.1.2.1. To 3.3.0.3

[navotera]

Hello @aesalgado

You can check on how to solve this problem here :

HTTP Error 500 While upgrading from 3.2.1.2 to 3.3.0.2

Hi @Heorhii, The error: PHP Fatal error: Uncaught Error: Call to a member function getConnection() on null …is caused by this issue: You can fix it by applying the following change to lib/pkp/classes/install/form/UpgradeForm.inc.php, or by using the command-line upgrade tool instead of the web-based upgrade form. Regards, Alec Smecher Public Knowledge Project Team

Hendra