[TYPO3-english] captcha extension after upgrading

[Sergio Catalá Gil]

Hi list, 

after upgrading to TYPO3 4.3.0 version, my captcha image isn't displayed
on my site. If I see source code for displaying it through other
extension, the error I get is:

Fatal Error: Extension key "lang" was NOT loaded!
(t3lib_extMgm::extPath)

Any clue?

Thanks in advance,
Sergio