IMAP parser - Meteor code must always run within a Fiber

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Hi there, I have a Gmail IMAP parser. I download messages from inbox and I want to insert them to the Mongo database. I am getting this error message: Error: Meteor code must always run within a Fiber. Try wrapping callbacks that you pass to non-Meteor libraries with Meteor.bindEnvironment. This is my code.

import { Meteor } from 'meteor/meteor';
import { insertTaskFromMessage } from '../../api/tasks/methods';
var Imap = require('imap');
var MailParser = require("mailparser").MailParser;

const gmail = Meteor.settings.private.gmail;

const imap = new Imap({
    user: gmail.user,
    password: gmail.password,
    host: 'imap.gmail.com',
    port: 993,
    tls: {
        secureProtocol: "TLSv1_method"
    }
});

const fetchMessage = (msg, seqno) => {
    const parser = new MailParser();
    parser.on('end', insertMessage);
    msg.on("body", (stream) => {
        stream.on("data", (chunk) => {
            parser.write(chunk);
        });
    });
    msg.on('end', () => parser.end());
};

const insertMessage = (mail) => {
    insertTaskFromMessage.call({
        title: mail.subject,
        description: mail.text,
        userEmail: mail.from[ 0 ].address
    }, (error) => {
        if (error) {
            console.log(error);
        }
    });
};

export default function () {
    imap.once('ready', () => {
        imap.openBox('INBOX', true, (err, box) => {
            if (err) throw err;
            const f = imap.seq.fetch('1:*', {
                bodies: [ 'HEADER.FIELDS (FROM TO SUBJECT DATE)', '' ]
            });
            f.on('message', fetchMessage);
            f.once('error', (err) => console.log('Fetch error: ' + err));
            f.once('end', () => imap.end());
        });
    });
    imap.on('error', (err) => console.log(err));
    imap.once('end', () => console.log('Connection ended'));
    imap.connect();
}