[TYPO3-english] TYPO3 Fatal Error: Extension key "lang" was NOT loaded!

[Tapio Markula]

Tomiţă MILITARU
> Hi,
> I was creating  a new page in the Typo3 backend and I got this error
> message:
> TYPO3 Fatal Error: Extension key "lang" was NOT loaded!
> (t3lib_extMgm::extPath)
> 
> Since then, I can't access the backend, but the site is up and running.
> 
> I've looked in localconf,php for that extension, but no extension is with
> that name (lang).

that is among some other core extension, which are not listed
error in some extension might cause that some core extension would not 
be loaded.