ANTLR3.5: I have a NullPointerException on string " "

[Oleksiy Pylypenko]

Input string is " " i.e. one space.
I have such rule:
WhiteSpace
    : ('\t' | '\v' | '\f' | ' ' | '\u00A0')    {$channel=HIDDEN;}
    ;
Here is my tokens: [[@0,0:0=' ',<24>,channel=99,1:0], [@1,1:1='<EOF>',<-1>,1:1]]
And during parsing:
Caused by: java.lang.NullPointerException
    at org.antlr.runtime.Parser.getMissingSymbol(Parser.java:73)
    at org.antlr.runtime.BaseRecognizer.recoverFromMismatchedToken(BaseRecognizer.java:611)
    at org.antlr.runtime.BaseRecognizer.match(BaseRecognizer.java:115)

[Terence Parr]

hi. the error is in the parser somewhere not the lexer. the fact that it provides the first token in your list indicates that the lexer had no problem with it.

T

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