I am going by memory, but I think it is AdControl, not Adcontrol. Just a thought.
It would help if you provided the line of xaml code, but it's not absolutely needed. Anyway, first to make sure that your project has the references to the two pubcenter dll files. If you do, try to clean the solution, and then build the solution. If that doesn't work, try exiting Visual Studio, then restarting it again and try the clean and build for the solution again. If this doesn't work, just let me know (I have some other ideas).
You are right.. I tried and it worked.. So,mad at myself right now lol