Here’s a useful ASP page which I wrote which will convert an Oracle Application Express 3.1 package export (or page export) to 3.0 automatically! Just in case you developed an application in 3.1, but need to install it in a 3.0 environment.
http://www.technologydribble.info/convert-oracle-apex3.1-package-to-3.0.asp
Enjoy!