'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

Check with the Android version.

If you are installing non-market apps, and incompatible version you will get this error.

Ex: Application targetted to 2.3.4 Your device is 2.2 Then you will get this error.