c# - Page Navigation Error WP RT -


everytime press button go second page main page debugger error:

unhandledexception += (sender, e) =>             {                 if (global::system.diagnostics.debugger.isattached) global::system.diagnostics.debugger.break();             };

my button pressed event this:

 private void hardwarebuttons_backpressed(object sender, backpressedeventargs e)         {             frame rootframe = window.current.content frame;              if (rootframe != null && rootframe.cangoback)             {                 e.handled = true;                 rootframe.goback();             }         }

in mainpage inicializate camera using <captureelement> , when press button, error: the requet invalid in current state in part of code: 

await _mediacapture.capturephototostreamasync(imgprop, stream);


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