java.lang.NullPointerException

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  • NullPointerException in FragmentManager
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  • java.lang.NullPointerException
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    • java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.app.FragmentManagerImpl.performPendingDeferredStart(android.support.v4.app.Fragment)' on a null object reference at android.support.v4.app.FragmentPagerAdapter.setPrimaryItem(FragmentPagerAdapter.java:130) at android.support.v4.view.ViewPager.populate(ViewPager.java:1175) at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:608) at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:570) at android.support.v4.view.ViewPager.setCurrentItem(ViewPager.java:551) at fragments.CategoryActivityFragment.onCategoryClicked(CategoryActivityFragment.java:56) at adapters.CategoriesAdapter$1.onClick(CategoriesAdapter.java:84) at android.view.View.performClick(View.java:5207) at android.view.View$PerformClick.run(View.java:21168) at android.os.Handler.handleCallback(Handler.java:746) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5443) 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)

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