Then not sure what you have done, possibly another app that was deleted which links to devices?
You could scroll through the past logs and see if you see any old log entries from App 135 which may help figure out what it is.
Check the last two posts here for another way to figure it out
One more thought, Go to Settings >> Network Setup >> Click Network Test
Use the ping test but type in hubitat.com instead of the IP listed and try to ping that.
If that doesnt work your hub cannot resolve host names.
