Get “Internal error in the expression evaluator” on “Add watch” function when trying to debug WCF service code (MSVS 2013)

Question

Few days ago I moved my solution to MSVS 2013. It works fine except one thing: when I trying to debug code of my WCF service it works, but when I want to watch state of any

Answer 1

Michael Freidgeim's answer helped me debug my issue. But I want to add additional details to the cause of my issue. Only slightly related to asker's question, but his error is extremely misleading.

We were using a Telerik controls RadGrid with GridDateTimeColumn's. The MinDate property on these grids defaults to 01/01/1980 so if you bind a date to this column that is less than that you will see this error. The weird thing is that the original binding and displaying didn't cause a problem, it was only when navigating to another page that the error was thrown.