1db.collection("users") returns an object of CollectionReference. CollectionReference has no function 'set', Hence the error. Perhaps you are looking for the function 'add' which adds documents.
2
3Replace
4
5                db.collection("users").set({
6                    points: 0,
7                    CurrentLevel: 0
8                })
9with
10
11                db.collection("users").add({
12                    points: 0,
13                    CurrentLevel: 0
14                })
15And I think that should solve your problem