SimpleSchema is not a constructor

Question

My app constantly crashes with this error. TypeError: SimpleSchema is not a constructor at attendances.js (imports/api/attendances/attendances.js:44:27). I've googled it and the StackOverflow solution doesn't work. I'm running simpl-schema and Collection2 Can anyone tell me whats wrong here?

import { Mongo } from 'meteor/mongo';
import SimpleSchema from 'simpl-schema';

const Attendances = new Mongo.Collection('attendances');

Attendances.debug = true;
Attendances.allow({
  insert: () => true,
  update: () => true,
  remove: () => true,
});

Attendances.deny({
  insert: () => false,
  update: () => false,
  remove: () => false,
});

const AttendancesSchema = new SimpleSchema({
  createdAt: {
    type: Date,
  },
}, {
  clean: {
    filter: true,
    autoConvert: true,
    removeEmptyStrings: true,
    trimStrings: true,
    getAutoValues: true,
  },
});

Attendances.attachSchema(AttendancesSchema);

export default Attendances;

This is the full error message in my terminal.

Path: ERROR MESSAGE

W20180620-21:07:11.542(10)? (STDERR) TypeError: SimpleSchema is not a constructor
W20180620-21:07:11.542(10)? (STDERR)     at attendances.js (imports/api/attendances/attendances.js:44:27)
W20180620-21:07:11.543(10)? (STDERR)     at fileEvaluate (packages/modules-runtime.js:339:7)
W20180620-21:07:11.543(10)? (STDERR)     at require (packages/modules-runtime.js:238:16)
W20180620-21:07:11.543(10)? (STDERR)     at publications.js (imports/api/userProfiles/server/publications.js:1:354)
W20180620-21:07:11.543(10)? (STDERR)     at fileEvaluate (packages/modules-runtime.js:339:7)
W20180620-21:07:11.543(10)? (STDERR)     at require (packages/modules-runtime.js:238:16)
W20180620-21:07:11.543(10)? (STDERR)     at register-api.js (imports/startup/server/register-api.js:1:195)
W20180620-21:07:11.543(10)? (STDERR)     at fileEvaluate (packages/modules-runtime.js:339:7)
W20180620-21:07:11.544(10)? (STDERR)     at require (packages/modules-runtime.js:238:16)
W20180620-21:07:11.544(10)? (STDERR)     at index.js (imports/startup/server/index.js:1:50)
W20180620-21:07:11.544(10)? (STDERR)     at fileEvaluate (packages/modules-runtime.js:339:7)
W20180620-21:07:11.544(10)? (STDERR)     at require (packages/modules-runtime.js:238:16)
W20180620-21:07:11.544(10)? (STDERR)     at main.js (server/main.js:1:14)
W20180620-21:07:11.544(10)? (STDERR)     at fileEvaluate (packages/modules-runtime.js:339:7)
W20180620-21:07:11.545(10)? (STDERR)     at require (packages/modules-runtime.js:238:16)
W20180620-21:07:11.545(10)? (STDERR)     at /Users/blakepascoe/Documents/dev/roll_call/.meteor/local/build/programs/server/app/app.js:1725:1

Answer 1

I tried the suggested fix in the comment by @bp123 that you should reset the Meteor project, and that fixed it for me too.

So I'm turning that comment into an answer:

Reset your project.

It does not seem impossible that a schema need to be added before any data is put in the database, but I'm very confused why this applies even for creating a Schema without attaching it to anything.