With this isValidSignature function:

// NOTE: This method not safe, contract may attack by signature replay.
     * Verify if the signer has a valid signature as claimed
     * @param signer The address of user who wants to perform an action
     * @param signature The signature signed by the signer
    function isValidSignature(address signer, bytes memory signature)
        returns (bool)
        bytes32 messageHash = keccack256(abi.encodePacked(***byte***(0x19), byte(0), address(this), signer));
        return ECDSA.recover(messageHash, signature) == signer;

I get linting for byte(0x19) stating there is an "Expected Primary Expression". Why does this happen?


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