Errors/Chain errors
FeeOverflow
A chain-side invariant failed; nothing to fix client-side — report it if it persists
Fee arithmetic overflowed, either multiplying the fee per gas by gas_limit or converting the EVM fee into Substrate balance decimals. Check for absurdly large gas_limit or fee-per-gas values in the transaction.
Declared by the EVM pallet; it classifies to the semantic code internal.
Remediation
A chain-side invariant failed; nothing to fix client-side — report it if it persists
The same explanation is available in the terminal: btcli explain FeeOverflow.