Error using mongoose

[ysilvela]

I'm using mongoose to query mongodb from nodejs and I obtain next error when query a document:

2015-12-11T08:56:13.381Z - error: uncaughtException: Cannot read property 'discriminatorMapping' of undefined

The line of code thats thwows error:

User.findOne.sync({id_company: id_c}, function(err, usr) {

[talha-asad]

You forgot to give first parameter, which is context this, in your case maybe try passing it User. The signature of .sync functions is similar to .call