Problem with building the app (Android App .apk)

[Boban]

@Boban

Project within project

"App Inventor is unable to compile this project." Error may be caused by: → Project in a project

Here is a guide (video instructions) on how to fix the problem that a project cannot be compiled: "App Inventor is unable to compile this project." [grafik] Possible reason: there is a project in a project. Caused by an extension that was imported from another AppInventor clone (here: AppyBuilder). This issue is now also increasingly reported in App Inventor, e.g. here: My app is getting server issues and here: Unable to build apk! See here how to fix this: