Error:PagerSlidingTabStrip cannot be cast to android.support.v4.view.ViewPager

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Error:PagerSlidingTabStrip cannot be cast to android.support.v4.view.ViewPager In the MainActivity.java mViewPager=(ViewPager)findViewById(R.id.page); mViewPager.setAdapter(new MyPagerAdapter(getSupportFragmentManager()) ); mTab=(PagerSlidingTabStrip)findViewById(R.id.tabs); mTab.setViewPager(mViewPager); In the activity_main.xml <com.astuetz.PagerSlidingTabStrip android:id="@+id/tabs" android:layout_height="wrap_content" android:layout_width="match_parent" android:layout_alignParentTop="true" /> <android.support.v4.view.ViewPager android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/page" android:layout_centerInParent="true" />