'App not Installed' Error on Android

Question

I have a program working in the Android Emulator. Every now and again I have been creating a signed .apk and exporting it to my HTC Desire to test. It has all been fine.

Answer 1

You also may encounter this issue because your device manufacturer did not license the Google commercial apps, such as Play Store, YouTube, Google Maps, etc. Follow this answer to solve the problem.