java.lang.reflect.InvocationTargetException in xamarin.android -


i exception when click button in fragment.
below code fragment 

    public override java.lang.object instantiateitem(viewgroup container, int position)         {             int pos = position + 1;             if (pos == 1) {                 view view = layoutinflater.from (container.context).inflate (resource.layout.pager_item, container, false);                 container.addview (view);                 return view;             } else if (pos == 2) {                 view view = layoutinflater.from (container.context).inflate (resource.layout.bookaservice, container, false);                 spinner spinner = view.findviewbyid<spinner> (resource.id.spinner);                 var adapter = arrayadapter.createfromresource (                                   container.context, resource.array.planets_array, android.resource.layout.simpledropdownitem1line);                  adapter.setdropdownviewresource (android.resource.layout.simpledropdownitem1line);                 spinner.adapter = adapter;                 var sel = spinner.selecteditem.tostring();                     button = view.findviewbyid<button>(resource.id.buttonservice);                 try{                     but.click += async (object sender, eventargs e) => {                         parseobject service = new parseobject("services ordered");                         service["userid"] = parseuser.currentuser.objectid;                         service["name"] = sel;                         service["username"] = parseuser.currentuser.get<string>("name");                         await service.saveasync();                         toast.maketext(container.context,"your service request taken , our processed within 1 hour",                         toastlength.long).show();                     };                 }catch (exception e){                     toast.maketext (container.context, e.tostring (), toastlength.long).show ();                 }                 container.addview (view);                 return view;               } else {                 view view = layoutinflater.from (container.context).inflate (resource.layout.login, container, false);                 container.addview (view);                 return view;             }         }

when click button in fragment code throws exception as

    java.lang.reflect.invocationtargetexception

i tried catch exception , toast screen didn't help.
please help.thanks.

the problem due space in declaring parse object.

    parseobject service = new parseobject("services ordered");

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