Ok guys you have to read what i wrote, because i'm repeating the same thing again and again... And my english is bad i know it

First, this is ELECTRUM SEED for sure.
Second, Yes i had the same problem on MULTIBIT. I recover a wallet with the correct seed. But the wallet was empty.
I have resolved this problem by finding an old version of my wallet file.
I can't do it for my electrum problem because i dont have an other old copy of the wallet.
Did you import a private key at any moment into your ('lost') wallet?
Yes i have a CSV file of key call electrum_private_keys. When i try to create a new wallet, using the option "importing bitcoin adress", it doesn't work, when i use my file, or when i copy , paste one or several adresses of the file.
The Button "Next" stay gray and i click on it.
Can i use my file to get something on it ? What can i do ?