Error creating component in asp.net application?

Question

i was doing a web app and it was doing fine until i backup my project and formatted ma PC, re install visual studio 2012. now when i switch to source code it works fine but when i switch design view i get a bunch of error on the place holders.

Error creating control - (Content)
cannot find type system.componentmodel.toolboxitemfilterattribute in module system.dll

but the app works fine when running , i just cant edit in designer view

Answer 1

I recently found out a similar error and the solution there works great.

All I had to do was delete all files in the bin directory of my project and reopen the project.. lol