Error encountered while upgrading the project from version 4.3.3 to version 7.0.1 #4719

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If you're creating a bug/problem report, please include followings:

• ABP Framework version: v4.3.3 - updated v7.0.1
• UI type: Angular
• DB provider: EF Core / Mssql
• Tiered (MVC) or Identity Server Separated (Angular): no
• Exception message and stack trace:
• Steps to reproduce the issue:"

"After upgrading the project, the lookup methods in the Pop-up are empty. I initially thought the issue was frontend-related, but it turned out to be API-related. The method being called returns a 500 error code as a response. It was working fine before the upgrade. Could there have been an issue during the upgrade? How can I resolve this?"

I'm waiting for your help.