The type of one of the primary key values did not match the type defined in the entity. See inner exception for details

Look at the exception message The argument types 'Edm.Int64' and 'Edm.String' are incompatible for this operation. Near WHERE predicate, line 1, column 90..

This implies that the ID of your AccountDefinition class is a long or Int64 however you are trying to query it using a string.

You need to do one of the following:

1. Change string[] in CustomersDetails(string[] SelectRight) to long[] and string in GetAccount(string id) to long id
2. Change return entities.AccountDefinition.Find(id); to return entities.AccountDefinition.Find(long.Parse(id));

Option 1 is the better option but will require more change (which I would recommend you do), Option 2 is less change but has the possibility it will blow up if id is null or a value which cannot be parsed to a long.

I know this is an old post but I figured I'd add a comment here since I had the same problem.

All I did was re-arrange the parameters in the find function.

I had it like this:

public ActionResult Details(Int32 id, string dataSource)
        {
            TVData_VW_ShowList tvdata_vw_showlist = context.TVData_VW_ShowList.Find(id, datasource);
            if (tvdata_vw_showlist == null)
            {
                return HttpNotFound();
            }
            return View(tvdata_vw_showlist);
        }

And I had to change it to this:

public ActionResult Details(Int32 id, string dataSource)
        {
            TVData_VW_ShowList tvdata_vw_showlist = context.TVData_VW_ShowList.Find(dataSource, id);
            if (tvdata_vw_showlist == null)
            {
                return HttpNotFound();
            }
            return View(tvdata_vw_showlist);
        }