I'm getting white blank page when trying to access my website and Craft login page. I haven't updated the website for few months. So I assume no files has been changed.
I checked with the hosting provider, and they say everything is okay on their part.
So I turned on the Dev Mode. And it came back with this error :
Fatal error: Class 'Craft\HttpRequestService' not found in /home/alpw7814/craft/app/framework/YiiBase.php on line 213
What could possibly cause this? Is there anything I need to check? Thank you in advance.