Crashes the tilemill server

style.mss

@sans:"Droid Sans Book","Liberation Sans Regular","Arial Regular","DejaVu Sans Book";
@sans_bold:"Droid Sans Bold","Liberation Sans Bold","Arial Bold","DejaVu Sans Bold";

Map {
}

#world {
  polygon-fill: #363636;
  line-color: #ccc;
  line-width: 0.5;  
}
/*
#highway[zoom>13]{
    line-width: 2;
    line-color: #fff;
}*/

#location[NAME='Wolfsburg']{
    text-name:'[NAME]';
    text-fill: rgba(0,0,0,0.5);
    text-size:20;
    text-face-name:@sans_bold;
    text-halo-radius: 1;
    text-halo-fill: rgba(72,191,222,1);  
    text-allow-overlap: true;   
    ::extraoutline{
        text-name:'[NAME]';
        text-fill: rgba(0,0,0,0);
        text-size:20;
        text-face-name:@sans_bold;
        text-halo-radius: 3;
        text-halo-fill: rgba(0,0,0,0.5);
        text-allow-overlap:true;
    } 
}