No Launcher activity found

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http://stackoverflow.com – I can't find any problem but it keep giving me the error "No Launcher activity found!" and "The launch will only sync the application package on the device!" can anyone solve this problem??? This is my Maniest <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.example.saikoro.MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /&g (HowTos)