Domoticz App en geofencing

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I am not sure if this is the right place for questions about the domoticz app(pro version).

When i add a geo fence and connect my switch/device and add de fence in meters a also have to add the adres. (longitude etc.)
When i push the button LAAD/LOAD i get an error "cannot find the location". When i push manual (handmatig) i can add the longitude etc.) After adding i cannot check if the right longtitude is saved. Nothing happens on the screen. When i push manual again all of my input is gone...

I checked the geofence by leaving the house by 200 meters (100 meter fence) en de switch did'nt changed....
Domoticz app works fine...
is there an manual for this app ?