DUnit Unit Testing in TestComplete

Hi

I am attempting to get some DUnit unit tests working in TestComplete 10.6

We have our application that contains all our unit tests and that gets selected into the Process field in the DUnit editor. However, when I clicked on Load to get all the unit tests, the error "Interface not supported" appears. The application has been compiled with tcDUnitSupport.pas included.

Any ideas are most appreciated.