(I definitely have the reply I sent hours ago in my 'Sent Items', but maybe
the Internet ate it. Anyway...)
Just to add to what MHL said, I notice your error concerns fileparam.py
which is odd.
It should be present:
/path/to/volatility$ find -type f -name fileparam.py
./volatility/plugins/fileparam.py
In case MHL's suggestion doesn't fix it, can you find the fileparam.py file?
Where did you get your copy of 2.4 from?
Might be worth grabbing it again from github.
Bridgey