I need to debug WPF Client with RIA Services. In VS 2010 it was working fine and now I am under VS 2012 and I an facing this error.
Any clue how to return to debugging?
I have already checked web.config and it has <compilation debug="true" targetFramework="4.0" />
Did you try right click on devenv.exe and select Troubleshoot compatibility? And always execute VS with administrator permission.