Errors/Chain errors
Undefined
A chain-side invariant failed; nothing to fix client-side — report it if it persists
Catch-all EVM validation error for cases without a dedicated variant, such as a malformed EIP-7702 authorization list or an unknown validation failure. Inspect the raw transaction for unsupported fields and check the node logs.
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 Undefined.