Getting odd error message from ANTLR lab

[QGhd]

Hi ANTLR experts,

I have entered this grammar to the lab:

// ANTLR Grammar for identifiers decorated by zero or one prefix (separated by underscore) and zero, one or more suffixes (also separated by underscores).
grammar PropNaming;

options { caseInsensitive = false; }

propnames
  : propname (NEWLINE+ propname)* NEWLINE* EOF
  ;

propname
  : mathprefix?
    baseprop
    contsuffix?
    intenssuffix?
  ;

mathprefix 
  : PREFIXln
  | PREFIXlog
  ;

baseprop 
  : TOKENA
  | TOKENm
  ;

contsuffix
  : SUFFIXig
  | SUFFIXres
  ;

intenssuffix
  : SUFFIXV
  | SUFFIXm
  ;

PREFIXln  : FRAGMENTln US ;
PREFIXlog : FRAGMENTlog US ;
TOKENA   : FRAGMENTA ;
TOKENm   : FRAGMENTm ;
SUFFIXig  : US FRAGMENTig ;
SUFFIXres : US FRAGMENTres ;
SUFFIXV   : US FRAGMENTV ;
SUFFIXm   : US FRAGMENTm ;

NEWLINE : '\r'? '\n' ;

fragment US : '_' ;

fragment FRAGMENTln : 'ln' ;
fragment FRAGMENTlog : 'log' ;
fragment FRAGMENTA : 'A' ;
fragment FRAGMENTm : 'm' ;
fragment FRAGMENTig : 'ig' ;
fragment FRAGMENTres : 'res' ;
fragment FRAGMENTV : 'V' ;

// end of file

and applied to this (from my point of view valid) input:

A
ln_A
A_ig
ln_A_ig
ln_m_m

And I get this error message: 1:0 mismatched input 'A' expecting {'and', 'or', 'not', '='}

All sample lines seem to be wrong for ANTLR.

Where is the error(s) in my grammar?

Oliver

[cheruvian]

I'm seeing this too... seems like the tool is broken even for the samples/examples in the dropdowns