When I upgrade from Redmine v5.0.2 (from redmine docker) to sameersbn docker image, 500 error occurs when pressing gantt chart PNG image button.

I am not sure if it still occur with clean install sameersbn v6.0.2 I'll try later.

My procedure

• db backup on redmine original 5.0.2 installation
• db restore on new sammersbn 5.0.2 + postgresql v14.
• antt-chart png button works okay.
• upgrading with changing tag of sameersbn docker image:
  • 5.0.6
  • 5.1.0
  • 5.1.1-4
  • 5.1.2
  • 5.1.4 (gantt ok)
  • 6.0.2 (gantt fail)

I 've backed up db from 5.1.4 working, and using 5.1.5 it works fine.