I see. The message seems quite sel-fexplicative; it appears that your hardware is not compliant with the Unity - Android minimum requirements:

if you search the internet you should be able to find several threads about this, for instance here is one:

http://stackoverflow.com/questions/10952192/minimum-requirements-for-unity-for-android

Open any of these  links

http://i44.tinypic.com/wbf5zn.png

Hi, for some reasons the attached image does not open.

Hello. here's the screen shot of the error i get. I think this can explain the problem better.

I'll check that out and let you know.

Ok. 

One thing; have you tried creating a simple Unity project (with a basic scene) without using Vuforia ? do you get the same problem then ?

HI.

adb detects my device and I have enabled USB debuggung on my device too.

I work on eclipse platform too. So when I connect my device and run an app oneclipse its working..

(But anyway Allesandro I've got another device Samsung galaxy S on which its working very fine. SO this wont be a major issue.)

Could you try opening a cmd console and executing the following command:

adb devices 

what do you get in the console ?

Hi .

When I use the build and run option of unity, I get an error saying the device found was not compatible.

When I build and get the apk on phone and try to install, the installation runs for sometime and I get a message application not installed.

Hi, I don't think it is a problem with the processor;

do you get any error message from Unity saying that it could not install ?

I changed it to 2.3.3. But still its not installing. What is the required processor for the app to run?

Hi, in Unity, from the File menu you can:

• select Build Settings..
• switch the Platform to Android
• Click on Player Settings
• go to the Inspector view of the Player Settings and set the Minimum API level to the level that you want;
  • note: even if your device Android version is 2.3, you should be able to run with any settings below that level (e.g. Android 2.2)
• Then you can click Build and Run and it should install and run the app.

If it does not, maybe the problem is that your device is not properly connected or recognized by your system.