New Post: Undefined responseXML on StartWorkflow

Here is the dataview side of things that launches jQuery and SPServices (obviously the RequestListName is replaced with the actual list name):

<a href="#">
<xsl:attribute name="onclick">
<xsl:text>javascript:StartWorkflow('</xsl:text>
<xsl:value-of select="@EncodedAbsUrl" disable-output-escaping="yes"/>
<xsl:text>','</xsl:text>
<xsl:value-of select="@ID" disable-output-escaping="yes"/>
<xsl:text>','RequestListName','emailTest');</xsl:text>
</xsl:attribute>
Email Me</a>

My javascript function is pulling in all parameters as string objects, but I am not sure if that causes issues or not with the SPServices functions. And I slightly modified my script but I am still getting an undefined error on xData.responseXML in the RunWorkflow function:

function StartWorkflow(ItemURL, ItemID, ListName, DesiredWorkflow)  {
        var id = "";
        $().SPServices({
            operation: "GetList",  
            listName: "RequestListName",  
            async: false,  
            completefunc: function (xData, Status) {  
                id = $(xData.responseXML).find("List").attr("ID").toString();  
            }  
        });
        //Get list Id from current page 
        if (id) { 
            this.guid = new SP.Guid(id); 
            var context = SP.ClientContext.get_current(); 
            var lists = context.get_web().get_lists(); 
            var list = lists.getById(this.guid); 
            //Set workflows variable to load and be accessible in callbacks 
            this.workflows = list.get_workflowAssociations(); 
            context.load(this.workflows); 
            context.executeQueryAsync(Function.createDelegate(this, onQuerySucceeded), Function.createDelegate(this, onQueryFailed)); 
        } 
        function onQuerySucceeded(sender, args) { 
            var enumerator = this.workflows.getEnumerator(); 
            while (enumerator.moveNext()) { 
                var workflow = enumerator.get_current();
                if (workflow.get_enabled() && workflow.get_allowManual()) { 
                    var workflowName = workflow.get_name(); 
                    if (workflowName == DesiredWorkflow){
                        var workflowGuid = '{' + workflow.get_id().toString() + '}';
                        //alert(workflowName + "  .....  " + workflowGuid);
                        RunWorkflow(ItemURL, ItemID, workflowGuid);
                    }
                }
            } 
        } 
        function onQueryFailed(sender, args) { 
            alert('Unable to retrieve workflows: ' + args.get_message()); 
        } 
    }
    function RunWorkflow(ItemURL, ItemID, workflowGuid)  {
        var loadingImage = 'Loader' + ItemID;
        var workflowDiv = 'WorkflowDiv' + ItemID;
        var workflowParams = "<root />";
        //Show our loading image
        document.getElementById(loadingImage).style.visibility = 'visible';
        $().SPServices({
            operation: "StartWorkflow",
            async:true,
            item: ItemURL,
            templateId: workflowGuid, 
            workflowParameters: workflowParams,
            completefunc: function (xData, Status) { 
                if(Status != "error"){
                    document.getElementById(workflowDiv).innerHTML = 'Item emailed';
                }
                else{
                    document.getElementById(workflowDiv).innerHTML = '<div style=\"color:#FF0000\">Error</div>';
                    if (xData.responseXML != undefined)
                        window.alert(xData.responseXML.text);
                    else
                        window.alert("Error. call assistance, probably the workflow was changed and has another GUID.");            }

            }
        });
    }

When I use the Fiddler I get a 404 error when it hits the SPServices function for StartWorkflow (GetList works fine). This is what is confusing me. I know SPServices is working because it works for GetList. But the StartWorkflow function is failing.

Again, any help to clear up my confusion on SPServices here would be appreciated.