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hi
I may have found a solution.
you have to edit the blockalgo.py file with vim and go to line 141 where the error is located.
replace "key" with "bytes(key)"
and now it should work.

hi
I had the same error and I may have found a solution.
You have to edit the blockalgo.py file with vim and go to the error:

on the line 141: self._cipher = factory.new (key, *args, **hwargs)...