BluetoothHeadsetClient: Could not bind to Bluetooth Headset Client Service with Intent

I want to use the BluetoothHeadsetClient. in order to use this hidden SDK code I use reflection.

I want to call

mBluetoothAdapter.getProfileProxy(this, mHeadsetProfileListener, BluetoothProfile.HEADSET_CLIENT);

but BluetoothProfile.HEADSET_CLIENT is hidden in BluetoothProfile.java. in order to solve it I run the following code

protected BluetoothProfile.ServiceListener mHeadsetProfileListener = new  BluetoothProfile.ServiceListener()
{
    @Override
    public void onServiceDisconnected(int profile) {            

    }

    @Override
    public void onServiceConnected(int profile, BluetoothProfile proxy)
    {

        mlisten = mHeadsetProfileListener;
        mHeadSetCleintObj = proxy;

        // reflection for getting the HEADSET_CLIENT type
        try {

            Class classRef = Class.forName("android.bluetooth.BluetoothProfile");
            Field field = classRef.getField("HEADSET_CLIENT");                
            if(profile == BluetoothProfile.HEADSET ) {
                mBluetoothAdapter.getProfileProxy(getApplicationContext(), mHeadsetProfileListener, field.getInt(proxy));
            }

        }
        catch (Exception e) {
            e.printStackTrace();
        }

        mBluetoothHeadset.getConnectedDevices();

    }
};


@Override
public void onDestroy() {
    unregisterReceiver(mPairReceiver);

    super.onDestroy();
}

field.getInt(proxy) value == 16 --> BluetoothProfile.HEADSET_CLIENT as I wanted. but when I run the

mBluetoothAdapter.getProfileProxy(getApplicationContext(), mHeadsetProfileListener, field.getInt(proxy));

I see the following error

E/BluetoothHeadsetClient﹕ Could not bind to Bluetooth Headset Client Service with Intent { act=android.bluetooth.IBluetoothHeadsetClient }

do you know how to solve this type of error?

Thanks!