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Load XML Errors( Error type: DataStructure Description: XML reffers to not existing parent )

in the file id ok
===================================================================
<?xml version="1.0" encoding="utf-8"?>
<tree id="0">
<item text="notice" id="books" open="1" call="onefuc" select="0">
    <item text="1" id="4028803c1c7b235f011c7b2d1d700005" ></item>
    <item text="2" id="4028803c1c9f1519011c9f16a62c0002" ></item>
    <item text="3 " id="4028803c1cbbc859011cbbdcfa3f0004" ></item>
    <item text="4" id="4028803c1cbd01f2011cbd2cf530000b" ></item>
<item text="5" id="4028803c1cc5e7a6011cc650bd23000a" ></item>
    <item text="6" id="4028803c1cda3606011cda43ccb30023" ></item>
    <item text="7" id="4028803c1cda4ccb011cdb01ed44000e" ></item>
</item>
</tree>
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but if i use jsp to out,the errors is out, help......
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js code:
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tree=new dhtmlXTreeObject("systemmenu","100%","100%",1);
tree.setImagePath("<%=path%>/resource/feohoojs/tree/imgs/csh_scbrblue/");
//tree.loadXML("<%=path%>/resource/feohoojs/tree/xml/tree_b.xml");    //is ok, the same code        
tree.setXMLAutoLoading("<%=path%>/projectmenu.do");
tree.loadXML("<%=path%>/projectmenu.do");

The top level ID in XML and ID assigned to the tree are not equal 

tree=new dhtmlXTreeObject("systemmenu","100%","100%",1); // <= you set top level ID as 1

<tree id="0"> <= in XML you have top level ID as 0

thank you !