I have recently installed Qt Creator 4.8.0 based on Qt 5.12.0 and I have it configured like in the image below. However, I haven\'t managed to start the debugger. As it can
I got the same error, but in my case I was using the MSVC compiler and the kit didn't manage to find the CDB debugger. I was able to fix it by going to "Add or remove programs" -> "Windows Software Development Kit" -> Modify -> Change -> Debugging Tools for Windows.
Wow! I found it!!! Here in the tab "projects", there are several build and run configurations. Despite you select a default kit, the final one being executed is the one in black under this tab.
Finally I disabled all of them except the one that was properly configured in the Kits window and it worked. I hope this information is helpful for someone. I don't think that part of the configuration is clear.
The same dumm error QT creator shows when you simply don't have gdb installed. Worked in my case ;)