Error: webauthn has error ( use cross platform)

I try to use webauthn by using cross platform.

but, I got a error. ( use platform has normal )

Error message is Error - Error: 1 remaining bytes after end of encoding

const credentialOption = {
      ...JSON.parse(noNested),
      rp: JSON.parse(rp),
      user: JSON.parse(user),
      pubKeyCredParams: JSON.parse(pubKeyCredParams),
      authenticatorSelection: JSON.parse(authenticatorSelection),
    };
    const originChallenge = credentialOption.challenge;
    credentialOption.challenge = b64ToByteArray(credentialOption.challenge);
    credentialOption.rp.id = location.hostname;
    credentialOption.user.id = b64ToByteArray(credentialOption.user.id);

    const credential = await navigator.credentials
      .create({ publicKey: credentialOption })
      .then((result) => result)
      .catch(() => 'cancel');

    if (credential === undefined || credential === 'cancel') {
      return 'cancel';
    }

    const credentialResult = {
      id: credential.id,
      type: credential.type,
      response: {
        clientDataJSON: JSON.parse(Uint8toString(credential.response.clientDataJSON)),
        attestationObject: CBOR.decode(credential.response.attestationObject),
      },
    };

    credentialResult.response.attestationObject.authData = parseAuthData(
      credentialResult.response.attestationObject.authData
    );
    if (credentialResult.response.attestationObject.attStmt.sig) {
      credentialResult.response.attestationObject.attStmt.sig = Array.from(
        credentialResult.response.attestationObject.attStmt.sig
      ).join(',');
    }
    credentialResult.response.credentialId = credentialResult.response.attestationObject.authData.id;
    credentialResult.response.originChallenge = originChallenge;
    credentialResult.response.transports = credential.response.getTransports().join(',');
    const userAgent = UAParser(navigator.userAgent);
    const os = userAgent.os;
    const browser = userAgent.browser;
    credentialResult.response.device = `${os.name} ${os.version}|${browser.name} ${browser.version}`;
    delete credentialResult.response.attestationObject.authData.id;
    return JSON.stringify(credentialResult);

This code is based on https://webauthn.guide/ demo site success

I don't know why not operate this code.