And now i get this error brute.rb:62in '' : underfined method 'captures' for NilClass
seed_base64 = wallet.match(/'seed': '([^']+)'/).captures.first
That indicates the script couldn't find the seed in your Electrum wallet. Try putting this just above that line:
puts wallet
That will print out the raw wallet (it's just a text file for Electrum). Read through it and see if it has something like this: 'seed': 'a349iYLbPwas1O4mXdLDcg/N1RLK2Hb6oZdee7JLsf6J79EGZORmLY9+a5yBryFxKtPBl3WWUdFmNjEdEXo8dg=='
If it doesn't print anything it didn't load your wallet for some reason. If it doesn't have a seed it might be a different wallet version. If it does have a seed we'll have to find the bug in my script.