[Typo3] Content type "Invalid value ("script")"

[Stefan Wimmer]

Hi all,

I am still a newbee in T3, so maybe I am missing something obvious. With the
testsite installed and working perfectly well it doesn't seem possible to
select "Script" as content type for a new content element.

The included examples with custom PHP-scripts work fine but in the content
type select box it says  "invalid value ("script")". Do I have to install an
extension or enable that option somewhere?

Thanks for your help,
Stefan