How to setup developer environment of mxnet on ubuntu?

i have tried to set up env following the tutorial: https://cwiki.apache.org/confluence/display/MXNET/MXNet+Developer+Setup+on+Mac

however , there is a problem like the picture:
Screenshot%20from%202018-11-05%2017%3A28%3A54

failed to find the choice ‘test_operator.py’ to attach to

There seems to be something wrong with your setup. Did you configure your launch.json correctly?