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your stack trace looks extremely suspect to me, it looks as if you built ros2 with python3.8 but it seems you're in a conda environment that is using python3.7? I may be wrong about the environment, but you definitely want to make sure you're using a single python version If we look at the last two lines of the stack trace

File “/home/moutalib/anaconda3/lib/python3.7/importlib/ init .py”, line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
ModuleNotFoundError: No module named ‘rclpy._rclpy’

The python 3.7 importlib is going to be looking in all of the python3.7 install paths for rclpy, but it will not find it because rclpy was installed with python3.8

your stack trace looks extremely suspect to me, it looks as if you built ros2 with python3.8 but it seems you're in a conda environment that is using python3.7? I may be wrong about the environment, but you definitely want to make sure you're using a single python version

File “/home/moutalib/anaconda3/lib/python3.7/importlib/ init .py”, line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
ModuleNotFoundError: No module named ‘rclpy._rclpy’