jQuery Drag and Drop doesn’t work when I add in FriendlyUrl assembly

I have created a drag and drop that allows users to drag a row from one GridView to another GridView which updates the record from Active to Inactive (and vise versa). The problem I am faced with is that when I add in a FriendlyUrl RouteConfig via the Global.asax Application_Start the record won’t save.

Parser Error Message: Could not load type ‘sometype’

I am experiencing an error that I am unable to resolve for some time now. I was wondering if someone can help identify the cause of this error? I am completely new to asp / asax. After some research, I think that the error I am getting is due to the web application trying to use outdated code. I was thinking to rebuild the c# file using Visual Studio and/or the entire project. However, I am completely new to C# and asp, and was wondering can give me some suggestions if this may fix the problem and/or if there is an possible alternate solution.