I am trying to upload an audio file from the sdcard to an ftp server. The logcat shows the following messages..

```
     09-04 18:47:10.767: W/System.err(12584): java.net.ConnectException: failed to connect to /127.0.0.1 (port 21): connect failed: ECONNREFUSED (Connection refused)
09-04 18:47:10.777: W/System.err(12584):    at libcore.io.IoBridge.connect(IoBridge.java:120)
09-04 18:47:10.777: W/System.err(12584):    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
09-04 18:47:10.777: W/System.err(12584):    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
09-04 18:47:10.777: W/System.err(12584):    at java.net.Socket.connect(Socket.java:849)
09-04 18:47:10.777: W/System.err(12584):    at org.apache.commons.net.SocketClient.connect(SocketClient.java:176)
09-04 18:47:10.777: W/System.err(12584):    at org.apache.commons.net.SocketClient.connect(SocketClient.java:268)
09-04 18:47:10.777: W/System.err(12584):    at com.example.andro.MainActivity$AsyncUpload.ftpUpload(MainActivity.java:56)
09-04 18:47:10.777: W/System.err(12584):    at com.example.andro.MainActivity$AsyncUpload.doInBackground(MainActivity.java:91)
09-04 18:47:10.777: W/System.err(12584):    at com.example.andro.MainActivity$AsyncUpload.doInBackground(MainActivity.java:1)
09-04 18:47:10.777: W/System.err(12584):    at android.os.AsyncTask$2.call(AsyncTask.java:264)
09-04 18:47:10.777: W/System.err(12584):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
09-04 18:47:10.777: W/System.err(12584):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
09-04 18:47:10.777: W/System.err(12584):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
09-04 18:47:10.777: W/System.err(12584):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
09-04 18:47:10.777: W/System.err(12584):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
09-04 18:47:10.777: W/System.err(12584):    at java.lang.Thread.run(Thread.java:856)
09-04 18:47:10.777: W/System.err(12584): Caused by: libcore.io.ErrnoException: connect failed: ECONNREFUSED (Connection refused)
09-04 18:47:10.787: W/System.err(12584):    at libcore.io.Posix.connect(Native Method)
09-04 18:47:10.787: W/System.err(12584):    at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:85)
09-04 18:47:10.787: W/System.err(12584):    at libcore.io.IoBridge.connectErrno(IoBridge.java:133)
09-04 18:47:10.787: W/System.err(12584):    at libcore.io.IoBridge.connect(IoBridge.java:118)
09-04 18:47:10.787: W/System.err(12584):    ... 15 more
09-04 18:47:10.787: W/dalvikvm(12584): threadid=11: thread exiting with uncaught exception (group=0x2b542210)
09-04 18:47:10.797: E/AndroidRuntime(12584): FATAL EXCEPTION: AsyncTask #1
09-04 18:47:10.797: E/AndroidRuntime(12584): java.lang.RuntimeException: An error occured while executing doInBackground()
09-04 18:47:10.797: E/AndroidRuntime(12584):    at android.os.AsyncTask$3.done(AsyncTask.java:278)
09-04 18:47:10.797: E/AndroidRuntime(12584):    at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
09-04 18:47:10.797: E/AndroidRuntime(12584):    at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
09-04 18:47:10.797: E/AndroidRuntime(12584):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
09-04 18:47:10.797: E/AndroidRuntime(12584):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
09-04 18:47:10.797: E/AndroidRuntime(12584):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
09-04 18:47:10.797: E/AndroidRuntime(12584):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
09-04 18:47:10.797: E/AndroidRuntime(12584):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
09-04 18:47:10.797: E/AndroidRuntime(12584):    at java.lang.Thread.run(Thread.java:856)
09-04 18:47:10.797: E/AndroidRuntime(12584): Caused by: java.lang.NullPointerException
09-04 18:47:10.797: E/AndroidRuntime(12584):    at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:471)
09-04 18:47:10.797: E/AndroidRuntime(12584):    at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:534)
09-04 18:47:10.797: E/AndroidRuntime(12584):    at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:583)
09-04 18:47:10.797: E/AndroidRuntime(12584):    at org.apache.commons.net.ftp.FTP.quit(FTP.java:794)
09-04 18:47:10.797: E/AndroidRuntime(12584):    at org.apache.commons.net.ftp.FTPClient.logout(FTPClient.java:697)
09-04 18:47:10.797: E/AndroidRuntime(12584):    at com.example.andro.MainActivity$AsyncUpload.ftpUpload(MainActivity.java:79)
09-04 18:47:10.797: E/AndroidRuntime(12584):    at com.example.andro.MainActivity$AsyncUpload.doInBackground(MainActivity.java:91)
09-04 18:47:10.797: E/AndroidRuntime(12584):    at com.example.andro.MainActivity$AsyncUpload.doInBackground(MainActivity.java:1)
09-04 18:47:10.797: E/AndroidRuntime(12584):    at android.os.AsyncTask$2.call(AsyncTask.java:264)
09-04 18:47:10.797: E/AndroidRuntime(12584):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
09-04 18:47:10.797: E/AndroidRuntime(12584):    ... 5 more

```

My code is:

```
  public class MainActivity extends Activity {

    TextView tv1;   
    Button bt1;

    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    tv1 = (TextView) findViewById(R.id.textView1);
    bt1 = (Button) findViewById(R.id.button1);
    bt1.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            if(new AsyncUpload().execute() != null)
            tv1.setText("uploaded");
        }
    });

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
    class AsyncUpload extends AsyncTask<String, Void, Void>{       
        public boolean ftpUpload(){
            FTPClient con = new FTPClient();
            try
            {

                con.connect("127.0.0.1"); //here i receive exception
                    //the exception is java.unknownhostexception
                    //java.net.UnknownHostException: Unable to resolve host "ftp.194.90.81.149": No address associated with hostname
                if (con.login("android", "123"))
                {
                    con.enterLocalPassiveMode(); 
                    String data = Environment.getExternalStorageDirectory().getPath() + "audiorecordtest.3gp";
                    ByteArrayInputStream in = new ByteArrayInputStream(data.getBytes());
                    boolean result = con.storeFile("/test.3gp", in);
                    in.close();
                    if (result) Log.v("upload result", "succeeded");
                    return true;
                }
            }
            catch (Exception e)
            {
                e.printStackTrace();
            }

            try
            {
                con.logout();
                con.disconnect();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
            return false;
        }

        @Override
        protected Void doInBackground(String... params) {
            ftpUpload();
            return null;
        }
    }

}

```