[antlr-interest] Problem with this antlr grammar.

[doctlo-antlr at yahoo.com]

header {
}

class MyLexer extends Lexer;
options
{
    k=3;
}
WS       : ('\n' | '\r')
              { _ttype = Token.SKIP; };
DIGIT        : '0'..'9'; 
UPPER        : 'A'..'Z';
LOWER        : 'a'..'z';
//NUMBER       : ('+'|'-')(DIGIT)+;
//REAL         : NUMBER '.' (DIGIT)*;
OPENP        : '(';
CLOSEP       : ')';
SEMI         : ';';
OPENB        : '[';
CLOSEB       : ']';
COLON        : ':';
PERIOD       : '.';
ESC          : '\\' ']';
PROP_VALUE   : OPENB ( ESC | ~']')*   CLOSEB;
PROP_IDENT   : UPPER (UPPER|DIGIT)?;

class MyParser extends Parser;
options
{
   k=3; 
}
collection   : (game_tree)+;
game_tree    : OPENP sequence (game_tree)* CLOSEP;
sequence     : (node)+ ;
node         : SEMI (property)*;
property     : PROP_IDENT  PROP_VALUE;


For some reason when I feed it the following:

(;GM[1])

line 1:3: expecting CLOSEP but found 'G'.

I have no idea why.
Can someone help?

Thanks 
T.L.Olczyk
2.7.4