Can't login after installation

I just did a fresh install of SuiteCRM and after it succesfully installed it redirected to the page but I get this error:

Fatal error: Class ‘AuthenticationController’ not found in /home/younggu0/public_html/crm/v2/include/MVC/SugarApplication.php on line 104

I’ve checked the permissions but it’s all OK, what else could it be?
Thanks a lot.

Check in the MySQL of your install to make sure there’s not a problem with the Flood table. If that’s got stuff in , drop the contents.

It’s possible a error during installation, which could usually be fixed with Quick Repair Rebuild but since you can’t login…

Have you actually migrated data into it yet? Cause it might be far quicker to reinstall than to troubleshoot if you haven’t.

Let’s see. Does line 104 look like this:

		$allowed_actions = (!empty($this->controller->allowed_actions)) ? $this->controller->allowed_actions : $allowed_actions = array('Authenticate', 'Login', 'LoggedOut');

        $authController = new AuthenticationController();

One other idea, some hosting companies have weird ways of handling PHP, so check whether they have set all the correct permissions too by contacting the support team.