[antlr-interest] NullPointerExption error in verilog.g

[kts81932]

HI..

recently, l learn about antlr-2.7.1.
to use antlr-2.7.1, dowonload verilog.g file
(http://www.antlr.org/resources.html) 
successfully compile it..(in vc++)..

i add TreeWalker to verilog.g file
and compile it.. below error occur 

#$%%*&@# internal error: java.lang.NullPointerException

fist time, i can not find where this error occur
finally i found that..

delay :
        POUND NUMBER | 
	POUND identifier |
        POUND LPAREN mintypmax_expression
	        ( COMMA mintypmax_expression
		  ( COMMA mintypmax_expression )?
		)?
	      RPAREN
        ;
mintypmax_expression :
        expression ( COLON expression COLON expression )?
        ;

to avoid error occurrence how can i change this grammer into 
TreeWalker??

Thanks...


 

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