Upgrading Problem

Hello everyone,
I have an issue upgrading the OJS platform from version 3.3.x to 3.4.x.
The upgrade process works without any problems when the platform does not contain any data.
However, when even a small amount of data is added, the upgrade fails and a number of errors appear.
My question is: Is there any modification I need to make to the existing data on the platform before starting the upgrade?

Hi @mansour.othman,

Could you please elaborate on the errors that appear? And, if possible, share error messages from your PHP error logs?

Thanks,

Roger
PKP Team