Debuggin with F5 or step into is not working


I have installed the Nsight plugins of Cuda 11.1 toolkit, into my new freshly downloaded eclipse CDT.
Everything works fine beside Debugging.

When I press the F5 key, or alternatively the step into Icon in the menu, the result is the same as that of pressing the F6 key, that is the debugger step over the line.

Previously, with Cuda 10.2, I worked with the nsight eclipse edition delivered by Nvidia and it worked fine.

Now I have a serious problem, which I have no idea how to solve.

Does anyone have any idea how to try to approach this problem?