Problem Multisig 2of2

Hi everybody,

I have a problem with my electrum wallet multisig 2of2. I would transfer my money to my coinbase Wallet, but I have a big problem to send my coins. When I create de transaction, I sign them, and when I click to send de transaction to the cosigner (and the cosigner pool) I have this message : "Failed to send transaction to the cosigning pool".

I had try to send my transaction by file, text and QR code but I can't sign it too.

When I create my wallet electrum give me a seed, one private key and 2 public key. I have the access to there informations and I had create a second wallet with the cosigner public key but impossible to sign the transaction.

After differents test I can't do a transaction, when I try to do a transaction Electrum shutdown without explaination.

So someone can helping me to resolve my problem? I just want transfer my coins to my coinbase wallet.

Or help me to transfer my multisig wallet 2of2 in a Standard wallet ?

PS: Sorry for my English I'm French^^.