Uncaught Error: Non-base58 character

[phpmac]

undefined
> Message('hello, world').verify("bc1pydpj45r52e5njm4j7apj3sycjnaugl5znprkph9y676lv9ad0zsq4785ga", "ILtDggv+4LT25kBsbqeZ72X1AdvZ4d43pEOlrTVXEU8tdZUoRCvIkyEN9hI0GX1NjsbvzHCS7kMHF9z9QL3jDhI=");
Uncaught Error: Non-base58 character
    at Object.decode (/Users/a/Downloads/hardhat/node_modules/bitcore-lib/node_modules/bs58/lib/bs58.js:51:37)
    at Base58.decode (/Users/a/Downloads/hardhat/node_modules/bitcore-lib/lib/encoding/base58.js:48:26)
    at Base58Check.decode (/Users/a/Downloads/hardhat/node_modules/bitcore-lib/lib/encoding/base58check.js:45:31)
    at Address._transformString (/Users/a/Downloads/hardhat/node_modules/bitcore-lib/lib/address.js:279:35)
    at Address.fromString (/Users/a/Downloads/hardhat/node_modules/bitcore-lib/lib/address.js:379:22)
    at Message.verify (/Users/a/Downloads/hardhat/node_modules/bitcore-message/lib/message.js:90:30)
> 
>