The server doesn't allow you to broadcast the transaction because the fee is too high.
I think you wanted to pay 20,000 sat as transaction fee, but you mistakenly set the fee rate to 20,000 sat/vbyte. If that's the case, you were lucky that the server didn't broadcast your transaction.
I'm Lucky that the server didn't proceed ?! Who said this, I have already set 10k sat. and I want to increase it to 20k sats.
Please read the post again before jumping,
Thanks.