rich:tree and a4j:include integration problem

[bibinsga25]

Hi,
I want to update a portion of my page based on the selection made on a rich:tree that is within the same page.But I am finding some problem with my code

I have a nodeselectionListener on my tree,which identifies which node has been selected according to its type,set a bean property which is the value of dynamic viewId
Node selection listener and viewId property

public void processSelection(NodeSelectedEvent event) {
 UITree tree = (UITree) event.getComponent();
 String selectedNodeType=((CustomerTreeNode)tree.getTreeNode()).getType();
 if(selectedNodeType.equals(CustomerTreeNode.SERVER_NODE)){
 setSelection("server");

 }
 if(selectedNodeType.equals(CustomerTreeNode.CUST_DETAILS_NODE)){
 setSelection("details");
 }
 }

public String getCurrentDynamicView(){
 System.out.println("inside current dynamic view");
 if(getSelection().equals("server")){
 System.out.println("Value is server");
 return "/pages/includes/customer-server-edit.jspx";
 }
 if(getSelection().equals("details")){
 System.out.println("value is details");
 return "/pages/includes/customer-info-edit.jspx";
 }
 System.out.println("Something else");
 return "/pages/includes/customer-info-edit.jspx";
 }

this is my a4j:include part

<a4j:include id="test" viewId="#{customerTree.currentDynamicView}"/>

I have given 'test' in the reRender list of rich:tree

So when I select one of the node,say server node,it changes the view in the a4j:include part,but when I switch back to the old view by selecting the default node,Im getting a javascript error (Unknown rutime error).Please help me with this issue