How fix error, cant insert/read from firebase realtime using xamarin form

Question

how to fix this error, Firebase.Database.FirebaseException: 'Exception occured while processing the request.
Url: https://***************************************************************/.json?print=silent
Request Data: {/*I comment this out,but this part is like my table property and its data */}
Response: {
"error" : "Permission denied"
}
'
and our database rule is;

{
"rules": {
"some_path": {
"$uid": {
// Allow only authenticated content owners access to their data
".read": "auth !== null && auth.uid === $uid",
".write": "auth !== null && auth.uid === $uid"
}
}
}
}