Thread Viewer Empty during Debug

Hello,

I am practicing the intermediate Nordic Academy online course, and I have a problem of the thread viewer.

I have enabled debug, I did everything strictly according to the training materials. 

However, I could not make the thread info to display.

6523.inter_less1_exer1.zip

The project is attached here with the build. I really tried everything I could, but none of them worked. I tried using different boards as well, and there was no difference.

Can anyone help me to see if there is anything I overlooked? 

Thank you very much in advance!

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