[chirp_users] Error encountered

I have "chirp daily" installed on my Linux Mint 18 laptop. Recently, I attempted to connect to my HT and the program did not start. So, I tried at the command line, and encountered this:

alexm@alexm-Surface-Pro ~ $ sudo chirpw Traceback (most recent call last): File "/usr/bin/chirpw", line 20, in <module> from chirp import chirp_common ImportError: No module named 'chirp'

Any ideas??

Thanks,

Alex