title: VS2010: Incompatible Reference when trying to add reference
body: <p>VS2010: In my newly created project, any time I try to add a reference to any of my other projects or, in this case, MySql.Data...I get an error that says "Incompatible Reference" - "In order to add it you should to change the project's target to a compatible framework first"</p>
  
  <p>My project's target is set to .NET 4 and whether or not the reference I'm trying to add is or isn't set to .NET 4 I still get the error.  Anyone got any suggestions?  Thanks</p>