I am building the following smart contract on Remix and I'm currently receiving these errors when trying to call addBook("Goosebumps", "RL Stine", 1).

pragma solidity ^0.8;

contract Library {

    struct Book {
        uint256 id;
        bytes32 title;
        bytes32 author;
        CoverType cover;

    enum CoverType { HardCover, Paperback }

    uint256 lastBookId;
    mapping(uint256 => Book) books;

    function addBook(bytes32 _title, bytes32 _author, CoverType _cover) public {
        Book memory newBook;
        newBook = Book(lastBookId, _title, _author, _cover);

From Tutorial Point they state

In Solidity we can assign String literal to a byte32 type variable easily. Solidity considers it as a byte32 literal.

contract SolidityTest {
  bytes32 data = "test";

Am I missing something? Here's the error that prints to the console.

transact to Library.addBook errored: Error encoding arguments: Error: invalid arrayify value (argument="value", value="Goosebumps", code=INVALID_ARGUMENT, version=bytes/5.5.0)

1 Answer 1


For pass bytes32 value you must convert your string (in this case) in exadecimal and after this operation you must to add remaining zeros needed get a hexadecimal of length 64 (without 0x).


Word: "test"

Exadecimal: 227465737422

Bytes32: 0x2274657374220000000000000000000000000000000000000000000000000000

In the last operation you must add 0x before 64 characters.

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