Electrum Bitcoin Wallet
Maybe connection issues? Cf. https://github.com/spesmilo/electrum/issues/5815. There's also this post: https://www.reddit.com/r/Electrum/comments/muwp6s/cant_send_coins_from_wallet_keep_getting_error/ If none of the above helps, you are probably better off creating a new post with a more detailed description of your setup.
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