Error: Cannot access a disposed of object. A common cause of this error is disposing of a context that was resolved from dependency injection and then later trying to use the same context instance elsewhere in your application. This may occur if you are calling Dispose() on the context, or wrapping the context in a using statement. If you are using dependency injection, you should let the dependency injection container take care of disposing of context instances.
Solution: Below are things, you can try to fix the problem: