android - setContentView method giving error in FragmentActivity -

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i newbie. line this.setcontentview(r.layout.activity_main);

in mainactivity.java giving android.view.inflateexception: binary xml file line #2: error inflating class viewpager error

i doing fragmentactivity tutorial codepuppet link

viewpager tag strange.

viewpager must fill full-package , class name.

<android.support.v4.view.viewpager  xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/pager"     android:layout_width="match_parent"     android:layout_height="match_parent" />

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