Cyclic reference of projects not allowed

Circular references to projects aren't allowed. For example, if MyProj references YourProj, then YourProj (or a project that references YourProj) can't reference MyProj. This error has the following cause and solution:

• You tried to add a reference to a project that is already part of the project.

  Remove the circular reference or references.

For additional information, select the item in question and press F1 (in Windows) or HELP (on the Macintosh).