Exception in thread "main" java.lang.NullPointerException
 at StartSimpleBug.main(StartSimpleBug.java:34)
(Tcl -eval:) couldn't read file "C:Swarm-2.2-java/lib/tcl8.4//word.tcl": no such file or directory
    while executing
"source C:\Swarm-2.2-java/lib/tcl8.4//word.tcl"
while evaluating: source C:\Swarm-2.2-java/lib/tcl8.4//word.tcl

在Eclipse环境中运行Swarm Tutorial for Java中的程序，总是出现这样的错误，请高手帮分析下什么原因呀？谢谢