Firebase Working but gives error

Firebase Database is running but gives permission error.
I changed the rules to:

       "Users" : {               
             "$user_id" : {
          ".read" : true,
            ".write" : "auth.uid === $user_id"                     

I can listen to the data, but it always gives an error on the screen.
How can I fix this, or is it a problem?

Can you show your error?

What are you calling here from firebase?

Please show related blocks also