Error while creating DID using Didkit-wasm library

Question

I am trying to generate a credential using the didkit-wasm library with the following code, but getting error with prepareIssueCredential method: key expansion failed. Any idea what i could be doing wrong

const did = `did:pkh:tz:` + userData.account.address;
  const credential = {
    '@context': [
      'https://www.w3.org/2018/credentials/v1',
      {
        alias: 'https://schema.org/name',
        description: 'https://schema.org/description',
        website: 'https://schema.org/url',
        logo: 'https://schema.org/logo',
        BasicProfile: 'https://tzprofiles.com/BasicProfile',
      },
    ],
    id: 'urn:uuid:' + uuid(),
    issuer: 'did:pkh:tz:tz1ZDSnw...',
    issuanceDate: new Date().toISOString(),
    type: ['VerifiableCredential', 'Company Credential'],
    credentialSubject: {
      id: did,
      name: company.name,
      description: company.description,
      url: company.url,
    },
  };

 let credentialString = JSON.stringify(credential);
  const proofOptions = {
    verificationMethod: did + '#TezosMethod2021', //subject's did
    proofPurpose: 'assertionMethod',
  };
  const publicKeyJwkString = await JWKFromTezos(
    'edpkuGHxcJDq9....' //issuer's public key
  );

  let prepStr = await prepareIssueCredential(
    credentialString,
    JSON.stringify(proofOptions),
    publicKeyJwkString
  );