Problem with maps - - > divide by zero

[discover]

What is the reason for this error meesage?

- Starting orux maps

- pushing the refresh button opening offlne maps. (see Screenshot below) :





Problem with maps - - > divide by zero





Other open map work on my Android Oreo Phone.



This map works on my  Android Oreo Tablet.



https://up.picr.de/34722435jo.jpg">

[discover]

At each start of my Android Oreo Phone  the following message appears , even when OruxMaps has not been started:



https://up.picr.de/34903368si.jpg">



How do I perform the map source reset (Kartenquellen-Reset)?