Found out the Issue and I will submit the bug report. I guess in previous version if you had a <telerik:GridViewExpressionColumn> you could exclude the "Expression" parameter. I had a column that did this because the expression was being built dynamically in the codebehind then added to the control. All I had to do was set the expression parameter to something rather than excluding it.
<telerik:GridViewExpressionColumn Expression=""/>
In conclusion,the argument can be blank, but it cannot be null.
After Upgrading from Q32011 to Q12012 Telerik Controls and also the target Silverlight version of a project from 4 to 5 I get this following error on a page load. The page worked fine prior to the change. Any help to point me in the direction of a resolution would be helpful.
Value cannot be null.
Parameter name: body