TinyVIz is not running

When i run "make" i give the command to tinyos/message and it properly make then i go to tools/java/net/tinyos/sim

When i give the command for make in this directory it gives given below error

Loading simulator plugins...
Exception in thread "main" java.lang.NullP ointerException
at net.tinyos.sim. PluginManager.r egister(PluginM anager.java:77)
at net.tinyos.sim. SimDriver.<init >(SimDriver.jav a:258)
at net.tinyos.sim. TinyViz.main(Ti nyViz.java:188)

I want to run TinyViz