c# - "System.Reflection.TargetInvocation Exception" in Windows Phone 8.1 -

c# - "System.Reflection.TargetInvocation Exception" in Windows Phone 8.1 -

i creating windows phone 8.1 app, have added wcf service in windows phone, when check wcf service, returns result, whenever trying phone call in windows phone project, giving me error.

system.reflection.targetinvocation exception

innerexception remains "null", can't getting main issue

how deal this, headache me. help appreciated.

here simple code:

servicereference1.service1client client = new servicereference1.service1client(); client.xxxxasync(id,name); client.xxxxcompleted += client_xxxxcompleted; void client_xxxxcompleted(object sender, servicereference1.xxxxcompletedeventargs e) { e.result = "giving error" - "targetinvocation exception" }

i getting error:

"error loading xaml, clr-microsoft.phone.controls.toolkit"

c# windows-phone-8.1