Could not connect to QML Debugger with kit Desktop Qt 5.14 MingW 64

[RSAM]

I have qt 5.14.2 installed on my win10 desktop.
(installed with offline installer, full installation nothing is left to tick)
Currenly i am trying to debug an empty QT quick application.
(everything is untouched, only files generated by Qt creator)

With kit Mingw32 it can be debugged and there will be a blank window pop up. But if i switch to Mingw64, there will be error messages.

The process hang at "Launching debugger"
And error messages as

"Could not connect to the in-process QML debugger, Do you want to retry?"

There is no useful information on any of the 8 bottom console/output.
Kit Mingw32 works fine, but 64 version is not.
I am not very familiar with Qt, I done some searching on the internet.
I check Enable QML in the Debugger setting
and i do have gdb debugger (which is specified in the Option -> Kits -> XXX Kits -> Debugger and it is not changeable) installed on my desktop.

But most of the articals is very old and a lot things don't match.
I would appreciate it if any one can help pointing the right direction for me.

[RSAM]

For those experiencing the same problem as myself, check your path for perivous GNU mingw installation.
I personally am a GNU user, so i have 64-bit mingw installed on my desktop, that's causes a confliction with the one come with QT creator installation.

[RSAM]

Just tried all the other examples, none of them can be build with 64bit kit...

[RSAM]

For those experiencing the same problem as myself, check your path for perivous GNU mingw installation.
I personally am a GNU user, so i have 64-bit mingw installed on my desktop, that's causes a confliction with the one come with QT creator installation.