System.Xml.Xsl.XsltException: Function 'soco:requestinfo()' has failed. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at socolibrary.XslHelper.requestinfo()
   --- End of inner exception stack trace ---
   at System.Reflection.RuntimeMethodInfo.InternalInvoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean isBinderDefault, Assembly caller, Boolean verifyAccess)
   at System.Reflection.RuntimeMethodInfo.InternalInvoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean verifyAccess)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.Xml.Xsl.FuncExtension.Invoke(XsltContext xsltContext, Object[] args, XPathNavigator docContext)
   at System.Xml.XPath.XsltFunction.InvokeFunction(XPathNavigator qy)
   --- End of inner exception stack trace ---
   at System.Xml.XPath.XsltFunction.InvokeFunction(XPathNavigator qy)
   at System.Xml.XPath.XsltFunction.getValue(XPathNavigator qy, XPathNodeIterator iterator)
   at System.Xml.XPath.XPathNavigator.Evaluate(XPathExpression expr, XPathNodeIterator context)
   at System.Xml.Xsl.Processor.RunQuery(ActionFrame context, Int32 key)
   at System.Xml.Xsl.VariableAction.Execute(Processor processor, ActionFrame frame)
   at System.Xml.Xsl.ActionFrame.Execute(Processor processor)
   at System.Xml.Xsl.Processor.Execute()
   at System.Xml.Xsl.XslTransform.Transform(XPathNavigator input, XsltArgumentList args, TextWriter output)
   at Sitecore.WebControls.XslFile.DoRender(HtmlTextWriter output) Xsl file could not be processed: /xsl/ClickTracker.xslt