I am trying to detect the pattern Number Space Word Number

It works until it encounters the end of file, then the Java code hangs on if (((LA(1)==Num))) .

Below is an excerpt of code. any ideas why this happens?

class FullFormParser extends Parser;

parseXml returns [List values = null]
: ( values = parSent )+ EOF ;

parSent returns [List values= new LinkedList()]

{String w="";}

: ( ( Num WS alphaNumDot WS Num) => w=vNumRepPNum

class FullFormLexer extends Lexer;

options {

k=2; // needed for newline junk

charVocabulary='u0000'..'u007F'; // allow ascii
}

WS : ( ' ' | ' ' )+ ;

Num : ('0'..'9')+ ;


thanks
Mel