Errors/Chain errors
FeeRateTooHigh
Check the argument values against the operation schema
set_fee_rate was called with a rate above the swap pallet's MaxFeeRate config constant. Compare the rate argument (u16-scaled fraction) against MaxFeeRate before submitting.
Declared by the Swap pallet; it classifies to the semantic code invalid_argument.
Remediation
Check the argument values against the operation schema
The same explanation is available in the terminal: btcli explain FeeRateTooHigh.