Unable to Edit Post Template

Hello,

We have just made upgrade One Identity Manager version from 8.1 to 9.1. We can not edit mail templates in Designer. While we were wanting to edit mail template, we face the error like below;

Could not file or assembly 'DevExporess.Pdf.v19.2 Core, Version=19.2.13.0, Culture=neural, PublicKeyToken= b88d1754d700e49a' or one of it's dependencies. The system cannot find the file specified.

Have you got any idea for this issue?

Best Regards,

Volkan Ceylan.