[Admin]

I see, looks like PostNuke or whatever is using functions.php has a high level of error reporting. Fixing that instance won't solve the problem because you will just get another error in a different place.

Find a line in your files that contains "error_reporting()" (not a vBulletin file, a custom file), and change whatever there is in there to 7, so it would look like this:

error_reporting(7);