Sorry for my bad English
I just bought a v2 smartThing hub and tried to connect to the wire free arlo base station. After I entered my arlo account in smartthing, it showed error page then froze. I took a look at the log. it showed:
java.lang.NullPointerException: Cannot invoke method sort() on null object @line 2558 (authPage)
It will contain Arlo Model Specific information that may assist you in setting up your ecosystem.
Second, I would recommend clearing the cache of your Arlo Application and restarting your device after it restarts to try to re-authenticate your credentials.