My Web Host Upgraded from PHP 5.2 to 5.3 and now I'm getting a fatal error in my MediaWiki installation

I have MediaWiki 1.13.3 installed and it has been working fine for a couple years. My web host just upgraded PHP versions on the server from 5.2.17 to 5.3.5, and now all of a sudden I'm getting this error:

Warning: Parameter 2 to Parser::parse() expected to be a reference, value 开发者_Python百科given in /usr/www/users/.../includes/StubObject.php on line 58

Fatal error: Call to a member function getCacheTime() on a non-object in /usr/www/users/.../includes/Article.php on line 3387

What changed in the new version of PHP that may be causing these errors?

Needed to upgrade from mediawiki version 1.13 to 1.16