I am running into following error

ExceptionsManager.js:71 Error: Missing function for promisify.
at index.js:235
at tryCallTwo (core.js:45)
at doResolve (core.js:200)
at new Promise (core.js:66)
at index.js:235
at User.sendEmailVerification (auth.js:107)
at FsendEmailVerification (firebase.js:24)
at userSendEmailVerification (_user.js:10)
at _user.js:21
at tryCallOne (core.js:37)
reactConsoleErrorHandler @ ExceptionsManager.js:71
console.error @ YellowBox.js:61
(anonymous) @ _user.js:12
tryCallOne @ core.js:37
(anonymous) @ core.js:123
(anonymous) @ JSTimers.js:100
callTimer @ JSTimersExecution.js:95
callImmediatesPass @ JSTimersExecution.js:199
callImmediates @ JSTimersExecution.js:214
(anonymous) @ MessageQueue.js:214
guard @ MessageQueue.js:46
__callImmediates @ MessageQueue.js:214
(anonymous) @ MessageQueue.js:128
guard @ MessageQueue.js:46
invokeCallbackAndReturnFlushedQueue @ MessageQueue.js:126
(anonymous) @ debuggerWorker.js:71
index.js:7

This started occurring after implementing sendEmailVerification in the following way

firebase.js

import Firestack from 'react-native-firestack';
/**
 * @desc root firebase node
 * @type {Firestack}
 */
export const firebase = new Firestack();
/**
 * @desc create user with email and password
 * @param {String} [email='']
 * @param {String} [password='']
 */
export const FcreateUserWithEmailAndPassword = (email = '', password = '') =>
 firebase.auth().createUserWithEmailAndPassword(email, password);
/**
 * @desc send user verification email
 */
export const FsendEmailVerification = () =>
 firebase.auth().currentUser.sendEmailVerification();

redux actions (using redux-thunk) (_user.js)

const userSendEmailVerification = () => {
 FsendEmailVerification()
 .then(() => console.log('Email sent successfully'))
 .catch(err => console.error(err));
};
export const userCreate = (email, password, repeatPassword) =>
 (dispatch) => {
 if (VpasswordsMatch(password, repeatPassword)) {
 dispatch({ type: CREATE_REQUEST });
 FcreateUserWithEmailAndPassword(email, password)
 .then((user) => {
 userSendEmailVerification();
 dispatch({ type: CREATE_SUCCESS, payload: user });
 })
 .catch(err => console.error(err));
 } else {
 console.error('Passwords do not match');
 }
 };

Issue pops up in console, user is created but no verification email is sent

Error seems to be produced by catch statement from FsendEmailVerification

Update error screenshot

Imgur