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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 android.support.v4.view.ViewPager.setCurrentItem(ViewPager.java:613)	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)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)