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Have you esported the jar, as suggested at the end of the article ?

Tip: if you get ClassDefNotFound (or similar) runtime errors, you might need to perform these extra steps:

1. Go to the Project > Properties > Java Build Path > Order and Export tab, and check (tick) theclasses.jar, Android x.y and Android Dependencies items.

2. Apply and rebuild the probject.

Thank you for the solution you was right :)

now when i try to run on the divice i get this error :

all right. This is because you are building on an Android version prior to 4.0 (e.g. 2.2). You could get rid of the error by building on Android 4.x,

or you can otherwise simply remove this part of the string:

screenSize|smallestScreenSize

Then it should be ok.

hello,

there is the error  it's is showed in this line (4times)

    <activity android:name="com.qualcomm.QCARUnityPlayer.QCARPlayerProxyActivity" android:label="@string/app_name" android:screenOrientation="portrait" android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen">

error :String types not allowed at ('configChanges="fontScale|keyboard|...)

These are the errors that Fares is facing :

Can you show the actual error messages that you see (maybe by attaching a screenshot) ?