CHIRP

After successfully downloading and adding more memories to my ICOM IC-91AD, I select the tab - Banks(Band A) or Banks(Band B). I receive the following error:

Exception in thread Thread-3:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 801, in bootstrap_inner
self.run()
File "/usr/lib/python2.7/dist-packages/chirp/ui/common.py", line 261, in run
job.execute(self.radio)
File "/usr/lib/python2.7/dist-packages/chirp/ui/bankedit.py", line 138, in execute
mappings = self.model.get_memory_mappings(mem)
File "/usr/lib/python2.7/dist-packages/chirp/drivers/icf.py", line 514, in get_memory_mappings
index = self._radio._get_bank(memory.number)
File "/usr/lib/python2.7/dist-packages/chirp/drivers/ic9x.py", line 83, in _get_bank
return mem._bank
AttributeError: Memory instance has no attribute '_bank'

Chirp still displays the band assignments, but no changes are permitted by Chirp. No error messages are displayed when I double click or single click a checkbox on the Banks(Band A) tab and no visible change is made. I checked the radio itself and there is no change made to the radio either.

I am using Ubuntu 16.04, serial port via USB dongle. apt-get update and dist-upgrade both performed successfully two days ago.

regards,
Brian
VE3IBW