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dhtmlx Folder dynamic loading failing

Hello

I have a problem when using dhtmlx Folder dynamic loading:
here's my code

dhxF = new dhtmlxFolders("container");
dhxF.loadXMLString(document.getElementById("xml_list').value, "../dhtmlxFolders/codebase/types/style.xsl");

dhxF.enablePaging(4,true); //using dynamic loading

and I use dhxF.goToPage(dhxF.getCurrentPage() + 1) // or - 1 to naivgate pages
also, the navigation component on the page is created with another element on the page

now here's the problem:
when the number of item inside xml is multiple of 4 (so 4, 8, 12, etc) the page works fine, however, when the number of item is not multiple of 4, it gives error when reaching to the last page
error: Incorrect XML
and the bottom left of the IE shows doXPath(...) 0 null...error

is this an known issue, or am I doing something wrong.
If it is an issue how can I work around it?, (I disabled dynamic loading and it seems to work fine, but I would like to use dynamic loading instead)


Thanks in advance

The most possible reasons of above error - incorrect response received from server - please check your server side code which generates responses for dyn. paging. 
( you can use debug version of dhtmlxcommon.js to check response text  - http://dhtmlx.com/docs/products/kb/index.shtml?cat=search&q=2545&ssr=yes&s=dhtmlxcommon )