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 goog

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.