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Attempt to invoke virtual method 'android.support.v4.app.FragmentTransaction android.support.v4.app.FragmentManager.beginTransaction()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'android.support.v4.app.FragmentTransaction android.support.v4.app.FragmentManager.beginTransaction()' on a null object reference	at com.munz.lop.HomeFragment.(HomeFragment.java:32)	at com.munz.lop.SliderActivity.onNavigationItemSelected(SliderActivity.java:100)	at android.support.design.widget.NavigationView$1.onMenuItemSelected(NavigationView.java:150)	at android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:811)	at android.support.v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152)	at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:958)	at android.support.design.internal.NavigationMenuPresenter$1.onClick(NavigationMenuPresenter.java:308)	at android.view.View.performClick(View.java:5716)	at android.view.View$PerformClick.run(View.java:22596)	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:7325)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)