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nullPointer Excpetion in org.sablecc.sablecc.Grammar.CLOSURE(Grammar.java:444)

While running SableCC on a simple grammar I got (I was using 2.18.1 so
I added a stacktrace):

any ideas ??

Arman.

java.lang.NullPointerException
java.lang.NullPointerException
        at org.sablecc.sablecc.Grammar.CLOSURE(Grammar.java:444)
        at org.sablecc.sablecc.Grammar.CLOSURE(Grammar.java:493)
        at org.sablecc.sablecc.Grammar.GOTO(Grammar.java:624)
        at
org.sablecc.sablecc.LR0Collection.<init>(LR0Collection.java:34)
        at
org.sablecc.sablecc.LR1Collection.<init>(LR1Collection.java:23)
        at org.sablecc.sablecc.Grammar.computeLALR(Grammar.java:92)
        at org.sablecc.sablecc.GenParser.caseStart(GenParser.java:110)
        at org.sablecc.sablecc.node.Start.apply(Start.java:32)
        at org.sablecc.sablecc.SableCC.processGrammar(SableCC.java:211)
        at org.sablecc.sablecc.SableCC.processGrammar(SableCC.java:141)
        at org.sablecc.sablecc.SableCC.main(SableCC.java:98)