BalanceLow

The sender's mapped account cannot cover the transaction's value plus maximum gas fee, detected during validation or when withdrawing the fee. Check the account balance against value plus gas_limit times the effective gas price.

Declared by the EVM pallet; it classifies to the semantic code insufficient_balance.

Remediation

Fund the signing account or reduce the amount; check with btcli wallet balance

The same explanation is available in the terminal: btcli explain BalanceLow.