[Tinyos-help] Lesson 4 tinyos-2.x:trouble executing java Listen

[sergio mena doce]

Doing tutorial 4 I've tried to run java Listen by typing: 
  
              sergio at sergio-desktop:/opt/tinyos-2.x/apps/BaseStation$ java net.tinyos.tools.Listen -comm   
              serial@/dev/ttyUSB0:telosb
              The toscomm JNI library was not found.
              Check that your tinyos-tools package is installed and try
              rerunning tos-install-jni.
              Aborting.

In addition,  a directory tinyos-2.x/tools has appeared misteriously.

Can anyone help me?

Thanks in advance.


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