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Object Must Implement IConvertible error in LINQ to Entities with group by

Posted By:      Posted Date: October 25, 2010    Points: 0   Category :ASP.Net
1 down vote favorite

Hi. I have an ASP.NET MVC application in which i am using entity model for connecting to MySQl database

Here I am joining 2 tables and then applying group by on one of the fields. Then fetching the result from GroupBy result. Everything is working fine on development machine but getting  error:

"Object Must Implement IConvertible"   when executing on the stagging server.

Can you please help me out why such error is occurring. I have taken the dump of database form staging server and then used that on development machine then also working fine. But when I placed the dump of development machine database on staging then getting the same exception.

So where is problem i am not understanding.

The model structure is



Here student and st

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I have a stored procedure which has worked perfectly well until I attempted to add UserId and SessionId fields to the Insert.

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