[Discuss-gnuradio] Making new block

Dear all,

I learn about Writing A Signal Processing Block for GNU Radio.
Then I run qa_howto.py. The result like this:

Traceback (most recent call last):
  File "./qa_howto.py", line 24, in <module>
    import howto
ImportError: No module named howto

Therefore, does it mean that there is error during making new block?

Thank you for your help

Regards
Makmur