WoW ! It took me a while to figure it out and debug it, but the problem is actually quite simple.
categoryAxis: {
categories: [CARREGADO,TENTATIVAS,ATENDIDO,CPC,BOLETOS ENVIADOS,BOLETOS PAGOS],
labels: {
visible: true,
font: ".85em, Verdana, Helvetica, Sans-Serif",
rotation: 0
}
Just remove the comma right after ".85em" and you are good to go.