Microsoft in its wisdom does some silly things. Sometimes some machines will have this set
and other machines not by default. In any case, if you do not have this set it will not allow you
to include projects inside another tfs project.
This may also cause this to occur in other circumstances. If you get this error here is the solution.
- Use windows explorer to go to C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727
- Right click on the Temporary ASP.NET Files and click properties
- On the securities tab give User full control
See article below:
Could not load file or assembly Access is denied