It looks like Electron Cash v3.2.0 may have updated the wallet file... and Electrum v3.1.3 cannot read the file correctly anymore.
I would suggest that you try downloading the latest version of Electrum, which is currently 3.2.2, from here and see if that works:
https://electrum.org/#downloadIf you still get the same error, you should be able to simply restore your wallet in Electrum 3.2.2 using the 12 word seed that you originally wrote down when you setup the wallet ("File -> New\Restore -> Standard Wallet -> I already have a seed").
NOTE: If you don't have the words, open Electron Cash and goto "Wallet -> Seed"