Mongo can’t canonicalize query: BadValue bad sort specification

The sort() method only accepts 1 or -1. Other values like true or false, null… will return this error “BadValue bad sort specification”.

.sort({“field”: 1})
.sort({“field1”: 1, “field2”: -1})

Reference: http://docs.mongodb.org/manual/reference/method/cursor.sort/#cursor.sort