TypeError: undefined is not a function while using node js

Have a problem with printing out the pgpMessage to console.

I have my on PGP public key in the original code.

Any thoughts how to solve this?

TypeError: undefined is not a function

at Object.getPreferredSymAlgo (/Users/user/Desktop/a/node_modules/openpgp/src/key.js:1017:31)

at Message.encrypt (/Users/user/Desktop/a/node_modules/openpgp/src/message.js:150:27)

var openpgp = require('openpgp');
var key = '-----BEGIN PGP PUBLIC KEY BLOCK ... END PGP PUBLIC KEY BLOCK-----';
var publicKey = openpgp.key.readArmored(key);
openpgp.encryptMessage(publicKey.keys, 'Hello, World!').then(function(pgpMessage) {
    console.log("Encrypted message:\n\n" + pgpMessage + "\n\n");
}).catch(function(error) {
    //error
});