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java.lang.NullPointerException: 	at android.support.design.widget.Snackbar.(Snackbar.java:183)	at android.support.design.widget.Snackbar.make(Snackbar.java:215)	at ca.davesautoservice.davesautoservice.MainActivity.onNavigationItemSelected(MainActivity.java:106)	at android.support.design.widget.NavigationView$1.onMenuItemSelected(NavigationView.java:151)	at android.support.v7.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:811)	at android.support.v7.view.menu.SubMenuBuilder.dispatchMenuItemSelected(SubMenuBuilder.java:84)	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$1.onClick(NavigationMenuPresenter.java:318)	at android.view.View.performClick(View.java:4463)	at android.view.View$PerformClick.run(View.java:18770)	at android.os.Handler.handleCallback(Handler.java:808)	at android.os.Handler.dispatchMessage(Handler.java:103)	at android.os.Looper.loop(Looper.java:193)	at android.app.ActivityThread.main(ActivityThread.java:5333)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:515)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:828)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:644)	at dalvik.system.NativeStart.main(Native Method)