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tabbar - this._content[...] is null or not an object

Hi,

I have posted before regarding forcing the reload of the current active tab.
I integrated one of the given solution to my application but i get a javascript error:

char:3
this._content[...] is null or not an object
code: 0

Here's my code snippet:

function initTabs(){
                  tabbar=new dhtmlXTabBar("a_tabbar","top");
                  tabbar.setImagePath('images/imgs/');
                  tabbar.preventIECashing(true);
                  //tabbar.setHrefMode("iframes-on-demand");
                  tabbar.setHrefMode("ajax-html");  
                  tabbar.setStyle("modern");
                  tabbar.setSkinColors("#FCFBFC","#F4F3EE","#F4F3EE");
                  tabbar.enableAutoSize(true,true);
                  //tabbar.enableAutoReSize(true); //not working with IE6
                  
                  tabbar.loadXML("menu.xml",function(){
                        tabbar.setTabActive("b1");
                  });
                  
                  tabbar._setTabActive_old=tabbar._setTabActive;
                    tabbar._setTabActive=function(tab,mode){
                          if (tab==this._lastActive){
                                // here the moment, when click on active tab occured
                                tabbar.forceLoad(tab.idd);
                          } else return this._setTabActive_old(tab,mode);
                    }
              }

-----

I seem to get this javascript error a lot with tabbar when i use the api functions of tabbar such as GoToNextTab etc...
Am i doing something wrong here?

BTW the script does seem to work fine with only html code(static content)! But mine is a web application that is displaying dynamic content from a database and is using JSP.

Thank you for helping out.

Unfortunately the issue can't be reconstructed locally.
The error description says that in some operation was used not existing ID  , tabbar was not able to locate content of tab by its ID

Please be sure that each tab has unique ID and operations against tabbar executed only after configuration load