Hello @Sudhansu and welcome to the ST Community :smiling_face_with_smiling_eyes:.
It seems the issue you are facing is a connection problem. Check if your connection cable is working. Also, it will be better to check your usb ports.
You can also try erasing the flash using STM32Cubeporgrammer, and make sure to activate the gdb server log in the "Debugger" tab of your debug configuration, this may helped you.
Best Regards.
STTwo-32
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