Agent.Attach error due to TechDomain

Hello,

My application under test is WPF based, and one click from it opens another application which is WINFORMS. To switch to the new application, I use the following code:

Agent.DetachAll();

Agent.Attach("my new app");

at the Attach call, I intermittently get the error : Agent wants to load a Root TechDomain as Child TechDomain: WIN32

I need urgent help getting around this, as I'm not sure what this means. 

Please ask me for any more details if needed. 

Thanks,

Roma