"This does not seem to be a 'Debug' Build", yet auto-detects 3 CDB debuggers

[snoop911]

I'm using Qt Creator 3.1.2 (based on Qt 5.3.1) on Win8x64..

I've built my project with the Debug configuration (not release) with the auto-detected compiler of MSVC2013 32-bit. In the 'Debuggers' tab, I see 3 entries, all CDB x86 or x64.

However, when I try to debug or step into, it pops up a message saying that it's not a debug build, why? Is there a path setup or download I need to do first in order to create a debuggable project?

http://imgur.com/pufrfvL