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我正在使用 jtwitter 库通过 Twitter 授权我的应用程序。我使用这个http://marakana.com/forums/android/examples/312.html进行身份验证、推文和读取状态。身份验证和读取状态工作正常。但是在点击 Tweet 按钮时会出现以下异常。哪里错了？？请帮我。

/* Responsible for posting new status to Twitter */
class PostStatusTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
  try {
    twitter.setStatus(params[0]);
    return "Successfully posted: " + params[0];
  } catch (Exception e) {
   e.printStackTrace();
    return "Error connecting to server.";
  }
}

@Override
protected void onPostExecute(String result) {
  super.onPostExecute(result);
  Toast.makeText(MainActivity.this, result, Toast.LENGTH_LONG).show();
}

 }

逻辑：

W/System.err(3073): http://api.twitter.com/1/statuses/update.json (anonymous)
W/System.err(3073):     at winterwell.jtwitter.URLConnectionHttpClient.processError(URLConnectionHttpClient.java:176)
W/System.err(3073):     at winterwell.jtwitter.OAuthSignpostClient.post(OAuthSignpostClient.java:129)
W/System.err(3073):     at winterwell.jtwitter.Twitter.updateStatus(Twitter.java:3220)
W/System.err(3073):     at winterwell.jtwitter.Twitter.updateStatus(Twitter.java:3161)
W/System.err(3073):     at winterwell.jtwitter.Twitter.setStatus(Twitter.java:2917)
W/System.err(3073):     at com.tarams.twitterdemo.MainActivity$PostStatusTask.doInBackground(MainActivity.java:244)
W/System.err(3073):     at com.tarams.twitterdemo.MainActivity$PostStatusTask.doInBackground(MainActivity.java:1)
W/System.err(3073):     at android.os.AsyncTask$2.call(AsyncTask.java:185)
W/System.err(3073):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
W/System.err(3073):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
W/System.err(3073):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
W/System.err(3073):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
W/System.err(3073):     at java.lang.Thread.run(Thread.java:1096)
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