Authentication and connection to a real time database (firebase) at the same time

[y~c]

Hey,

I'm connected to firebase's real time database.

Now I am also trying to authenticate users.

What happens is that at some point I get such an error:

node_modules/angular/fire/auth/auth.d.ts: 8:22 - error NG6002

I think there is some kind of conflict because I installed  angular/fire and then angularFire2.

I worked with a guide to connecting to firebase's real time database.

And then I worked with an authentication guide that worked with angularFire2 ..

Bottom line I have some questions:

1. What is the difference between angular/fire to angularFire2?

2.Is it possible to work on the same project with both of you at the same time?

3. If not, what do I do ..?

Thanks in advance!

p.s. Sorry for my English ... working on it too ..;)