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java.lang.IllegalStateException: Fragment already active	at android.support.v4.app.Fragment.setInitialSavedState(Fragment.java:581)	at android.support.v4.app.FragmentStatePagerAdapter.instantiateItem(FragmentStatePagerAdapter.java:114)	at com.heinrichreimersoftware.materialintro.slide.SlideAdapter.instantiateItem(SlideAdapter.java:93)	at com.heinrichreimersoftware.materialintro.view.FadeableViewPager$PagerAdapterWrapper.instantiateItem(FadeableViewPager.java:124)	at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:1003)	at android.support.v4.view.ViewPager.populate(ViewPager.java:1151)	at android.support.v4.view.ViewPager.populate(ViewPager.java:1085)	at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1611)	at android.view.View.measure(View.java:18797)	at android.widget.LinearLayout.measureVertical(LinearLayout.java:898)	at android.widget.LinearLayout.onMeasure(LinearLayout.java:629)	at android.view.View.measure(View.java:18797)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)	at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135)	at android.view.View.measure(View.java:18797)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)	at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1458)	at android.widget.LinearLayout.measureVertical(LinearLayout.java:746)	at android.widget.LinearLayout.onMeasure(LinearLayout.java:629)	at android.view.View.measure(View.java:18797)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)	at android.view.View.measure(View.java:18797)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)	at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1458)	at android.widget.LinearLayout.measureVertical(LinearLayout.java:746)	at android.widget.LinearLayout.onMeasure(LinearLayout.java:629)	at android.view.View.measure(View.java:18797)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)	at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2658)	at android.view.View.measure(View.java:18797)	at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2108)	at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1224)	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1460)	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1115)	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6023)	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)	at android.view.Choreographer.doCallbacks(Choreographer.java:670)	at android.view.Choreographer.doFrame(Choreographer.java:606)	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:148)	at android.app.ActivityThread.main(ActivityThread.java:5481)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)