Accordion jQuery UI Options not working

Hello,

in the past I was able to use something like that:

jQuery(document).ready(function(){

    var o = (new Date).getDay(); // Get the Daynumber

    var c = new Array("Sonntag","Montag","Dienstag","Mittwoch","Donnerstag","Freitag","Samstag")[o]; // Set a name fr the number (4 = Donnerstag)

    "Montag" == c ? (jQuery("#accordions-272.accordions").accordion("option","active",0),

    jQuery("#accordions-273.accordions").accordion("option","active",0),

    jQuery("#accordions-274.accordions").accordion("option","active",0),

    jQuery("#accordions-275.accordions").accordion("option","active",0)):

    

    "Dienstag"==c?(jQuery("#accordions-272.accordions").accordion("option","active",1),

    jQuery("#accordions-273.accordions").accordion("option","active",1),

    jQuery("#accordions-274.accordions").accordion("option","active",1),

    jQuery("#accordions-275.accordions").accordion("option","active",1)):

    

    "Mittwoch"==c?(jQuery("#accordions-272.accordions").accordion("option","active",2),

    jQuery("#accordions-273.accordions").accordion("option","active",2),

    jQuery("#accordions-274.accordions").accordion("option","active",2),

    jQuery("#accordions-275.accordions").accordion("option","active",2)):

    

    "Donnerstag"==c?(jQuery("#accordions-272.accordions").accordion("option","active",3),

    jQuery("#accordions-273.accordions").accordion("option","active",3),

    jQuery("#accordions-274.accordions").accordion("option","active",3),

    jQuery("#accordions-275.accordions").accordion("option","active",3)):

    

    "Freitag"==c&&(jQuery("#accordions-272.accordions").accordion("option","active",4),

    jQuery("#accordions-273.accordions").accordion("option","active",4),

    jQuery("#accordions-274.accordions").accordion("option","active",4),

    jQuery("#accordions-275.accordions").accordion("option","active",4))

});

But after the last updates this solution does not work anymore for me. I get an error in the browser console.

(Uncaught Error: cannot call methods on accordion prior to initialization; attempted to call method 'option')

Did this plugin use the jquery ui accordion still? Or have anything changed in the code?

Thanks for your help.

Greetings

Magnus