Cannot use map from mapsforge

Hi, I’m an android developer and I want to use map from mapsforge to build my app. Unfortunately that I got this error when I open app with map from mapsforge. It’s okay to open app with map download from grapphhoper server

Please help, thank you.

For Mapsforge + VTM map related things, better ask in their forum.

Hint: VTM provides a GettingStarted example in its samples collection.