What works for me is to compile without a device attached or an emulator running. It goes through the compile process, then stops when it can't find a device to run the newly created app on. You can find your newly compiled app in the b4a project folder, in the Objects folder. It will be the file there that ends in .apk - it will either be TheNameOfYourProject.apk -or- result.apk. Hope this helps...