The map is black, somebody help me

Summary of Issue:
Need help! I am using the free license for 30 days, but after marking the terrain on the computer, the map in APP Drone Depoy appears all black with the streets blank, not to mention that I can not connect my Mavic Pro with App Drone Deploy. Does the fact that the map appears all black means that it is not possible to perform the flight operation? Please help me, soon my license expires and I will not be able to experience Drone Deploy. Thank you so much!

Date Issue Began:

Drone Model:
Mavic Pro

Mobile Device Model and OS version:
iPhone 7 Plus OS . version11.0.3

If you have no data connection/Wifi on your mobile device where you are flying, you will need to cache the map area, before you leave home. On Android devices you just need to zoom into the area on the app, on Apple devices, I believe you have to enable map caching.

In some areas of the worked the map may go black when you zoom in too far. Have you tried zooming out?
Make sure the DJI app is off before you turn the Drone Deploy app on.

I would suggest uninstalling and reinstalling the app and also turning the mobile device off and back on to clear out possible conflicts.