speech recognition - UWP SpeechRecognition exception with file grammar -


i'm tring add custom srgr grammar speechrecognition in w10 uwp app. i've w10 creators update.

app goes in exception on "recognizer.recognizeasync" without code , message when add grammar file below

private async void button_click(object sender, routedeventargs e)         {             try             {                  using (speechrecognizer recognizer = new speechrecognizer())                 {                      var webgrammar = new speechrecognitiontopicconstraint(speechrecognitionscenario.websearch, "websearch", "web");                     //recognizer.constraints.add(webgrammar);                      storagefile grammarfile =                       await storagefile.getfilefromapplicationuriasync(                         new uri("ms-appx:///grammar.xml"));                      recognizer.constraints.add(new speechrecognitiongrammarfileconstraint(grammarfile));                      speechrecognitioncompilationresult compilationresult = await recognizer.compileconstraintsasync();                      speechrecognitionresult result = await recognizer.recognizeasync();                      string recognizedtext = "non ho capito";                     if (result.status == speechrecognitionresultstatus.success)                     {                         recognizedtext = result.text;                     }                      await dispatcher.runasync(windows.ui.core.coredispatcherpriority.normal, () =>                     {                         uiuserinput.text = recognizedtext;                     });                 }              }             catch (exception ex)             {                 system.diagnostics.debug.writeline(ex.message);             }         }

ideas?


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