Line-length exception for Etherum Wallet

Hey guys, I am having a really strange issue I cant figure out.

I am trying to recover the password for a clients ether wallet and having some trouble.

I ran ether2john.py on the json keystore file and tried cracking it with -m15700 (scrypt wallet) I keep getting the error Line-length exception which does not make sense to me as I am useing the proper mode and using the direct output from ether2john.

Any help would be much appreciated.