Speech recognition , unknown error issue in android - android

I am trying to do a browser control appication with voice in android. I am using RecognizerIntent.ACTION_RECOGNIZE_SPEECH intent to recognize voice. It usually works but sometimes when voice recognition pop up opens and comes with "unknown problem" and my WebView don't load my URL, stays with old URL.
Here is my code:
//Load web view to default search screen
webView.loadUrl(Constant.DEFAULT_VOICE_BG);
Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
intent.putExtra(RecognizerIntent.ACTION_RECOGNIZE_SPEECH, getClass()
.getPackage().getName());
intent.putExtra(RecognizerIntent.EXTRA_PROMPT,
GeneralConstants.TEXT_VOICE);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
intent.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS, 5);
startActivityForResult(intent,
GeneralConstants.VOICE_RECOGNITION_REQUEST_CODE);
Thanks for any idea.
Best Regards.

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Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
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startActivityForResult(intent, REQUEST_CODE);

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and
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?
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Thank You

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