Class functions from script include are not getting called in Lab platform

[saradaa]

I copied code from labs exactly and did multiple labs, but could never get a call to class function working in lab instance. If I change it to function code only , it works. Below is a snippet of code.

Now able to call class function in business rule and client script. I have made sure that I copy code exactly from the lab work.

Script:

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var AssignmentGroupUtils = Class.create();
AssignmentGroupUtils.prototype = Object.extendsObject(AbstractAjaxProcessor, {
    countGroupMembers: function() {

        var grpName = "";
        var message = "There are no members in this Assignment Group";
        var groupID = this.getParameter('sysparm_group_id');

        var grpMems = new GlideRecord('sys_user_grmember');
        grpMems.addQuery('group.sys_id', groupID);
        grpMems.query();

        if (grpMems.next()) {
            grpName = grpMems.getDisplayValue('group');
        } //close if

        if (grpName != "") {
            message = "There are " + grpMems.getRowCount() + " members in the " + grpName + " group";
        } //close if

        return message;

    },

    type: 'AssignmentGroupUtils'
});