[TYPO3-mvc] Dispatcher Ajax RootlineUtility warning

[RAKIBI Anass]

hey , 
what I meant by AjaxDispatcher is the used to make Ajax calls possible , I got it from this tutorial:

http://t3-developer.com/extbase-fluid/extensions-erweitern/ajax-in-extensions/ajax-dispatcher-eid-in-typo3-61/

I want to use in on front end , I already could make it on my local server , but once I installed the extension on my online server , it shows the error .

Now for the typo version , i just mistyped it , I meant 6.2.6

Thanks for your help