Strange code error
 

My site: iilura.com

It seems things are going ok, but there's this funny line at the top of my site;

Help please? ^^

ETA:

There's tons more error codes popping all over the place, and I can't seem to access the admin control panel. It also seems to log me in and out every now and then.

When I log in, this appears;

Instead of messing with the script, I suggest that you set the error reporting not to display the Notice messages through php.ini
However, if you don't have access to edit the PHP configuration, then you can put this line on top of the functions.php file
For the Warning messages that are showing up, it's probably because the path to the session folder is incorrect, or it's not writable.
Again, you'll need to edit the php.ini, but if you can't try to use this code.
Put the above code inside functions.php file before the session_start() is called.