In my previous experiment I used Bitcoin ABC to claim my fractions of my bitcoin cash. This involved downloading the entire blockchain which took over 4 days. The Electron wallet is obviously much faster because it does not need to download the entire blockchain.
If you have an Airbitz wallet, the instructions at https://medium.com/airbitz/how-do-i-get-my-bitcoin-cash-from-airbitz-e97982e3fc4c are very good. It takes a bit of time but it works.
If you see this error,
it just means you are using the wrong address. The software is fine, your BCH are fine and all is well. Just figure out the right address to claim your bitcoin cash from.
The most difficult part is the manual typing out of your private key from the Airbitz wallet mobile app. Everything else is straight forward.