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Attempt to invoke virtual method 'void android.support.v4.widget.DrawerLayout.closeDrawer(int)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.widget.DrawerLayout.closeDrawer(int)' on a null object reference	at com.example.user.navwithtab.MainActivity.onNavigationItemSelected(MainActivity.java:157)	at android.support.design.widget.NavigationView$1.onMenuItemSelected(NavigationView.java:153)	at android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:810)	at android.support.v7.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152)	at android.support.v7.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:957)	at android.support.design.internal.NavigationMenuPresenter$1.onClick(NavigationMenuPresenter.java:328)	at android.view.View.performClick(View.java:5198)	at android.view.View$PerformClick.run(View.java:21147)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:148)