DDMS : java.lang.nullPointerException at com.android.ddmlib.Client.sendAndConsume

i has create android_2.1 emulator , when ever i rum any application , after some seconds CONSOLE will generate error like that

[2011-09-23 21:53:43 - ddms]null
java.lang.NullPointerException
        at com.android.ddmlib.Client.sendAndConsume(Client.java:572)
        at com.android.ddmlib.HandleHello.sendHELO(HandleHello.java:142)
        at com.android.ddmlib.HandleHello.sendHelloCommands(HandleHello.java:65)
        at com.android.ddmli开发者_如何学Cb.Client.getJdwpPacket(Client.java:671)
        at com.android.ddmlib.MonitorThread.processClientActivity(MonitorThread.java:317)
        at com.android.ddmlib.MonitorThread.run(MonitorThread.java:263)

is any type of error and can have any solution of this error ?

.. errors generally mean that there's a problem in the communication between ddms and the emulator you have fired up.

Have a look at this.