private void CreateAndEnableFirebaseInstance()
{
FirebaseManager firebase = FindObjectOfType <FirebaseManager>() as FirebaseManager;
if (firebase == null)
{
Instantiate(firebasePrefab);
firebase = FindObjectOfType <FirebaseManager>() as FirebaseManager;
}
//delete database version player pref
PlayerPrefs.DeleteKey("database_version");
firebase.CheckDatabaseVersion();
}