InDesign CS6 javascript: importXML and remove empty pages

I use InDesign CS6. I wrote a javascript to add an option into menu: it first imports an XML in a document, then removes empty pages. As run, before it actually imports an XML file, it removes empty pages. So there aren't enough pages for the XML.

How to excute these 2 functions as wanted? Here is my program:

var menuItem = "XML";
var smaTitle1 = "Import XML";

var sma1 = app.scriptMenuActions.add(smaTitle1);

    // Add an Event Listener
    sma1.addEventListener(
        /*event type*/   'onInvoke',
        /*event handler*/ function(){
            importXML(xmlPath);
        }
    );
    sma1.addEventListener(
        /*event type*/   'afterInvoke',
        /*event handler*/ function(){
            // Remove empty pages
            alert("remove pages");
            removeEmptyPages();
        }
    );

function importXML(xmlPath){
        if (app.documents.length != 0){
        var myDocument = app.documents.item(0);  
         
        //import the entire XML structure in the document.
        var myXMLImportPreferences = myDocument.xmlImportPreferences;
        myXMLImportPreferences.allowTransform = false;
        myXMLImportPreferences.ignoreWhitespace = true;
        myXMLImportPreferences.removeUnmatchedExisting = false;
        myXMLImportPreferences.importStyle = XMLImportStyles.MERGE_IMPORT;
        myXMLImportPreferences.repeatTextElements = true;
        
        var path = new File(xmlPath);
        var file = path.openDlg("Importer XML", "XML:*.xml", false);
        if (file != null) {
            myDocument.importXML(file);                   
        }
        }
}

function removeEmptyPages(){
    ...
    // a loop to remove empty pages
    pages[i].remove();
    ...
}