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I can not find the prob in my app ;/

If you have more than one activity where one is blank you might be starting your app with that activity is set to be the start up one I suggest you check your AndroidManefist.xml file

you should see this intent filter with the main (start up) activity

            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER"

make sure its enclosed within your MainActivity declaration in the manifest

<activity> ... here ... </activity>

if that did'nt help try to fix you project properties and clean the project (fix : right click on the project folder in eclipse -> Android Tools -> Fix Project Properties) (Clean : From the Menu click "Project" -> Clean -> chose your project and click ok)

Hope this help :)

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