[ERROR] [ApiClient] : TypeError [ERR_INVALID_ARG_TYPE]: The first argument must be of type string or an instance of Buffer, ArrayBuffer, or Array or an Array-like Object. Received undefined

[merugus]

While running flexjs example locally it throws below error. I have verified keys and works fine from live console.

[2021-05-29T23:59:08.330Z] [ERROR] [ApiClient] : TypeError [ERR_INVALID_ARG_TYPE]: The first argument must be of type string or an instance of Buffer, ArrayBuffer, or Array or an Array-like Object. Received undefined
at Function.from (buffer.js:333:9)
at Object.exports.generateDigest (C:\work\HPP\cybersource-flex-samples-node-master\express-flexjs\node_modules\cybersource-rest-client\src\authentication\payloadDigest\DigestGenerator.js:13:29)
at exports.callAuthenticationHeader (C:\work\HPP\cybersource-flex-samples-node-master\express-flexjs\node_modules\cybersource-rest-client\src\ApiClient.js:409:36)
at exports.callApi (C:\work\HPP\cybersource-flex-samples-node-master\express-flexjs\node_modules\cybersource-rest-client\src\ApiClient.js:507:25)
at exports.generatePublicKey (C:\work\HPP\cybersource-flex-samples-node-master\express-flexjs\node_modules\cybersource-rest-client\src\api\KeyGenerationApi.js:97:29)
at C:\work\HPP\cybersource-flex-samples-node-master\express-flexjs\app.js:88:26
at Layer.handle [as handle_request] (C:\work\HPP\cybersource-flex-samples-node-master\express-flexjs\node_modules\express\lib\router\layer.js:95:5)
at next (C:\work\HPP\cybersource-flex-samples-node-master\express-flexjs\node_modules\express\lib\router\route.js:137:13)
at Route.dispatch (C:\work\HPP\cybersource-flex-samples-node-master\express-flexjs\node_modules\express\lib\router\route.js:112:3)
at Layer.handle [as handle_request] (C:\work\HPP\cybersource-flex-samples-node-master\express-flexjs\node_modules\express\lib\router\layer.js:95:5)