[antlr-interest] How to generate code files for treeGrammarFileName.g?

[cokey5614 at sina.com]

 Hi,
I created treeGrammarFileName.g file(it is started with [tree grammar fileName]) and treeGrammarFileNameWalker.testSuite file in source folder, and then
tried the command :
    org.antlr.gunit.Interp treeGrammarFileNameWalker.testSuite
but,error{
    java.lang.ClassNOtFoundException:treeGrammarFileNameLexer
    at java.net.URLClassLoader$1.run(Unknown Source)
} always happen.
in fact, in source folder, there are only treeGrammarFileName.java and treeGrammarFileName.class , 
there is no treeGrammarFileNameLexer.java file.
but, It seems that treeGrammarFileNameLexer.java and treeGrammarFileNameParser.java are necessary too.
Q:How to generate [ treeGrammarFileNameLexer.java and treeGrammarFileNameParser.java] code files for treeGrammarFileName.g?

thanks 
                          cokey

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