ATL simple object wizard - “Object Xxx already exists” error

Question

I am attempting to create a new COM object in my DLL using the ATL Simple Object Wizard in Visual Studio 2005.

I enter the short name for the object

Answer 1

Also happens in VS 2008. However Clean solution and Clean project from build option solves this :-)

Answer 2

Is it defined in a library you are referencing?

Answer 3

I never found out why the wizard determined that the object name existed already - I'm guessing something was cached somewhere that I couldn't track down.

In the end, I appended a 2 to the end of the interface name when creating it which allowed it to be added. Then I replaced all the occurrences of IXxxInterfaceName2 with IXxxInterfaceName. Everything worked after this.

If I ever track down the root cause of this problem, I'll update the answer.