[TYPO3] jw_calendar

[Ilaria De Marinis]

Hi list,
I've installed this jw_calendar extension but when I try to get my page 
I receive this error:
TYPO3 Fatal Error: Extension key "overlib" was NOT loaded! 
(t3lib_extMgm::extPath)

Any help?
Thanks a lot
Ilaria

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Ilaria De Marinis 
Settore Automazione Biblioteche
Phone: +3906-44486052
CASPUR - Via dei Tizii ,6 - 00185 Roma
e-mail: demarinis at caspur.it
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