Android - Facebook SDK installed but can't use Facebook button -

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i have installed facebook sdk , have login set up, using basic button made when use button use, one:

<com.facebook.widget.loginbutton android:id="@+id/facebook_button" android:layout_width="wrap_content" android:layout_height="wrap_content"/>

i runtime error?

3650-3677/com.spencerfontein.ueat e/androidruntime﹕ fatal exception: asynctask #3 java.lang.runtimeexception: error occured while executing doinbackground() @ android.os.asynctask$3.done(asynctask.java:299)

not sure why happening. there i'm missing?

thanks in advance?

i missing in android manifest.xml

<activity android:name="com.facebook.loginactivity"             android:label="@string/app_name" />

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