Cannot launch debugger after upgrade to latest python extension

[ChenghaoZHU]

Environment data

• VS Code version:1.28.2
• Extension version (available under the Extensions sidebar): XXX
• OS and version: windows 10
• Python version (& distribution if applicable, e.g. Anaconda): Anaconda python 2.7.15
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): conda
• Relevant/affected Python packages and their versions: XXX

Actual behavior

Logs

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)

c:\Users\chzhu\.vscode\extensions\ms-python.python-2018.10.0\pythonFiles\experimental\ptvsd
Traceback (most recent call last):
  File "c:\Users\chzhu\.vscode\extensions\ms-python.python-2018.10.0\pythonFiles\experimental\ptvsd_launcher.py", line 16, in <module>
    import ptvsd.debugger as vspd
ImportError: No module named debugger

[ChenghaoZHU]

After I upgrade the ptvsd, now it works.
But this experience is annoying. I think it's better to give some information or tips.

[DonJayamanne]

Closing in favor of #3283