[TYPO3-project-seminars] TYPO3 4.2.5 -project-seminars does not anymore

[jon piguet]

Hi Oliver,
first of all thank you for this great extension!

I updated a seminar extension from 0.5.3 to the current 0.7.1 according 
to the description in the manual.
The only thing when I try to see the seminars in the FE :


Warning: 
require_once(/webhome/mirus.ch/www/typo3conf/ext/oelib/class.tx_oelib_Autoloader.php) 
[function.require-once]: failed to open stream: No such file or 
directory in 
/webhome/mirus.ch/www/typo3conf/ext/seminars/pi1/class.tx_seminars_pi1.php 
on line 25

Fatal error: require_once() [function.require]: Failed opening required 
'/webhome/mirus.ch/www/typo3conf/ext/oelib/class.tx_oelib_Autoloader.php' 
(include_path='.:/usr/share/php:/usr/share/pear') in 
/webhome/mirus.ch/www/typo3conf/ext/seminars/pi1/class.tx_seminars_pi1.php 
on line 25


Can you give some help where to start fixing?

Best regards
Jon