java.lang.NullPointerException: Attempt to invoke virtual method 'android.support.v4.app.FragmentTransaction android.support.v4.app.FragmentTransaction.replace(int, android.support.v4.app.Fragment)' on a null object reference

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Attempt to invoke virtual method 'android.support.v4.app.FragmentTransaction android.support.v4.app.FragmentTransaction.replace(int, android.support.v4.app.Fragment)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'android.support.v4.app.FragmentTransaction android.support.v4.app.FragmentTransaction.replace(int, android.support.v4.app.Fragment)' on a null object reference
at com.example.h6.personalfinancegidget.BaseFragmentForMonthPlan.getPlanMonthFragment(BaseFragmentForMonthPlan.java:39)
at com.example.h6.personalfinancegidget.MonthlyPlanActivity$1.onPageSelected(MonthlyPlanActivity.java:68)
at android.support.v4.view.ViewPager.dispatchOnPageSelected(ViewPager.java:1939)
at android.support.v4.view.ViewPager.scrollToItem(ViewPager.java:687)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:671)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:632)
at com.example.h6.personalfinancegidget.MonthlyPlanActivity$2.onTabSelected(MonthlyPlanActivity.java:82)
at android.support.design.widget.TabLayout.dispatchTabSelected(TabLayout.java:1149)
at android.support.design.widget.TabLayout.selectTab(TabLayout.java:1142)
at android.support.design.widget.TabLayout.selectTab(TabLayout.java:1112)
at android.support.design.widget.TabLayout$Tab.select(TabLayout.java:1407)
at android.support.design.widget.TabLayout$TabView.performClick(TabLayout.java:1511)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)

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