ANTLR charVocabulary and line number error messages

hi,

 I've been working through some simple Lexer examples in ANTLR (java) and
have come across a problem with my grammer (included below). It gets as
far
as I'd expect it to but when complaining about the unknown character
sequence refers to the problem being at "Line 1:293" - when its actually
something like "Line 14:2"

is there some way to get it to recognize lines again? (what in my grammar
has stopped it doing this - charVocabulary??)

any help appreciated,
thanks,
asjf

{
im****t java.io.*;
}

class TestLexer extends Lexer;

options { charVocabulary='\3'..'\377'; }

COMMENT : ';' (~('\r'|'\n'))+
 { System.out.print("COMMENT "); }
 ;

NEWLINE : ('\r''\n')=> '\r''\n' //DOS
        | '\r'                  //MAC
        | '\n'                  //UNIX
        { System.out.println("NEWLINE"); }
        ;

WS      : (' '|'\t')
   { System.out.print("WS ");
    $setType(Token.SKIP); } ;