Hello Hassanur Rahman,
I think you might have a problem while connecting to the database. The wizard is trying to connect to the database to extract the entities ( as I can see on the attached image ) but it failed, so please double check your connection string as well as whether you have the same connection string name in:
2- ObjectScopeProvider at
a- AdjustForDynamicLoad function.
b- Database function.
Then try again, the problem should be solved.
If the error remains, please let me have a look at you code.
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