2) This should be in the altcoin section not bitcoin.
Beyond what is above, take a look at: https://www.reddit.com/r/Namecoin/comments/kycern/how_to_get_nmc_out_of_coinomi/
IIRC NMC does some odd things with their keys / wallets. It's been a while but I think the above might help.
If not the subreddit I posted above does seem to be somewhat active, they might be able to help.
-Dave
Oh sorry I just saw your message.
I just made it work the private key has just been merged to new key, thank you very much my friend for your help
[Yes i would no longer use WALLETGENERATOR . NET]
I hope this will help other people ;-).