> For the complete Linea documentation index, see [llms.txt](/llms.txt). > Agents can fetch this page as Markdown at [https://docs.linea.build/reference/smart-contracts/interfaces/l1/il1messagemanagerv1.md](https://docs.linea.build/reference/smart-contracts/interfaces/l1/il1messagemanagerv1.md). # IL1MessageManagerV1 # `IL1MessageManagerV1` ### MessageDoesNotExistOrHasAlreadyBeenClaimed ```solidity error MessageDoesNotExistOrHasAlreadyBeenClaimed(bytes32 messageHash) ``` _Thrown when the message has already been claimed._