I wanted to make a New Job with similar settings to an existing one, so I used
the "Copy existing job" and changed the settings for the new job.

Trying to build this new project made Hudson fail with a NullPointerException
when trying to find the root module.

Looking in the config.xml file, I see that it still refers to the old project in
the <rootModule> element. This doesn't appear anywhere on the web config page.