java.lang.Error: Error opening DSound for capture

[NARs]

hi all.
when i excuete the code , i got the error msg "java.lang.Error: Error opening DSound for capture" , how to solve the problem ?

import javax.media.CaptureDeviceManager;
import javax.media.CaptureDeviceInfo;
import javax.media.DataSink;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.NoProcessorException;
import javax.media.NotRealizedError;
import javax.media.Processor;
import javax.media.format.AudioFormat;
import javax.media.rtp.*;
import javax.media.protocol.ContentDescriptor;
import javax.media.protocol.DataSource;
import javax.media.control.FormatControl;
import javax.media.control.TrackControl;
 
import java.util.Vector;
import java.io.*;
 
public class sendMedia extends Thread {
  CaptureDeviceInfo di = null;
  float fFrameRate = 44100.0F;
  Processor p = null;
  DataSink d;
 
  public sendMedia(String url) {
    //Get the CaptureDeviceInfo for the live audio capture device
    Vector deviceList = CaptureDeviceManager.getDeviceList(new AudioFormat("linear",
                                                                           44100,
                                                                           16,
                                                                           2)); 
    if (deviceList.size() > 0)
      di = (CaptureDeviceInfo)deviceList.firstElement();
    else {
      System.exit(-1);
    }
 
    try { 
      p = Manager.createProcessor(di.getLocator()); 
    } catch (IOException e) { 
      System.exit(-1); 
    } catch (NoProcessorException e) { 
      System.exit(-1); 
    }
 
    int ProcessStatus;
    p.configure();
 
    while(p.getState() == 140) {}
 
    p.setContentDescriptor(new ContentDescriptor(ContentDescriptor.RAW));
    TrackControl track[] = p.getTrackControls(); 
    boolean encodingOk = false;
    //Go through the tracks and try to program one of them to
    //output gsm data. 
    for (int i = 0; i < track.length; i++) { 
      if (!encodingOk && track[i] instanceof FormatControl) {  
        if (((FormatControl)track[i]).setFormat(
                  new AudioFormat(AudioFormat.GSM_RTP,  8000, 8, 1)) == null) {
          track[i].setEnabled(false); 
        }
        else {
          encodingOk = true; 
        }
      } else { 
      //we could not set this track to gsm, so disable it 
      track[i].setEnabled(false); 
      } 
    }
    //At this point, we have determined where we can send out 
    //gsm data or not. 
    //realize the processor 
    if (encodingOk) {
      p.realize();
      while(p.getState() ==200) {}
    //get the output datasource of the processor and exit 
    //if we fail
      DataSource ds = null;
      try { 
        ds = p.getDataOutput(); 
      } catch (NotRealizedError e) { 
        System.exit(-1);
      }
      //hand this datasource to manager for creating an RTP 
      //datasink our RTP datasimnk will multicast the audio 
      try {
        String srcFile = "/C:/tmp/test.wav";

     //   MediaLocator m = new MediaLocator(url);
        MediaLocator m =  new MediaLocator("file:" + srcFile);
        d = Manager.createDataSink(ds, m);
      } catch (Exception e) {
        System.exit(-1);
      }
    }
  }
 
  public void run() {
    try {
      p.start();
      d.open();
      d.start();
    } catch (Exception e) {
      System.exit(-1);
    }     
  }
 
  public static void main(String args[]) {
   // sendMedia send = new sendMedia(args[0]);  //ex:rtp://192.168.1.2:3000/audio/1
    String str = "rtp://192.168.1.2:3000/audio/";
    sendMedia send = new sendMedia(str);  //ex:rtp://192.168.1.2:3000/audio/1
    Thread startSend = new Thread(send);
    startSend.start();
  }
}

Any help will be appreciated!

[literallyjer]

Are you sure the device you are trying to capture from exists?