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DHTMLX Accordion

Whe I execute this:

var dhxAccord = new dhtmlXAccordion("MIOLO","dhx_black");
dhxAccord.addItem("d01","jjj");


I get this error when try to add items:

Invalid Argument in line 9 dhtmlxaccordion/codebase/dhtmlxaccordion.js

How to fix that ?

Thanks

Cleverson