Error de análisis XML: no se encontró ningún elemento Ubicación: moz-nullprincipal (no fuerte con ajax)

I know this question has been asked many times and from what i have researched on this error it appears that it happens because cross domain ajax is only allowed for JSONP, not XML. But i am having trouble finding where this call is being made so I can't exactly find where the problem is. Everything is working fine until I added the following code

@EventListener(targets="licensingStatus", events="onchange")
public void onLicenseStatusChange(IRequestCycle cycle){
    cycle.getResponseBuilder().updateComponent("licenceAuthRequiredDiv");
}

This is the component that the above code is updating

<div jwcid="licenceAuthRequiredDiv@Any">
      <span jwcid="@If" condition="ognl:company.licensingStatus == @com.fexco.wuams.valueobject.LicensingStatus@Pass && inApprovalMode()" renderTag="literal:false">
            <input jwcid="licensingApprovalDateRequired@DatePicker" disabled="ognl:disabled || isLicensingApprovalDateDisabled()"
            value="ognl:company.licensingApprovalDate" displayName="message:company.licensingApprovalDate" validators="validators:maxDateToday,required" />
     </span>
     <span jwcid="@Else" renderTag="literal:false">
            <input jwcid="licensingApprovalDate@DatePicker" disabled="ognl:disabled || isLicensingApprovalDateDisabled()"
            value="ognl:company.licensingApprovalDate" displayName="message:company.licensingApprovalDate" validators="validators:maxDateToday" />
      </span>
</div>

Using Firebug, when this is hit and moves through and a POST and GET requests are made and I get the following on the POST: 302 Moved Temporarily and the GET request just hangs with the following: XML Parsing Error: no element found Location: moz-nullprincipal:{a752d6c1-8e61-4faf-9084-97124f7b3596} Line Number 1, Column 1:

I know it is not much to work with so if ye need anymore information just ask, but can anyone shine some light on this for me?