[TYPO3-english] fatal error after upgrading from 4.2 to 4.3 tx_seminars

[Rene Gulager]

Hi I'm upgrading a TYPO3 from 4.2 to 4.3

Im getting an error in Fatal error: Call to undefined method 
stdClass::fetchGroupData() in 
/srv/www/htdocs/typo3_src-4.3.14/typo3/sysext/cms/tslib/class.tslib_fe.php 
on line 683

In apache error log im getting

[Thu Nov 24 11:22:52 2011] [error] [client 192.168.11.1] PHP Fatal 
error:  Callto undefined method stdClass::fetchGroupData() in 
/srv/www/htdocs/typo3_src-4.14/typo3/sysext/cms/tslib/class.tslib_fe.php 
on line 683, referer: 
http://www.site.locale/uddannelse/uddannelse/registrering.html?tx_seminars_pi1%5Buid%5D=66&ect_url=http%3A%2F%2Fwww.site.locale%2Fuddannelse%2Fuddannelse%2Fregistrering%2Freg                                 
istrering.html%3Ftx_seminars_pi1%255Bseminar%255D%3D66%26tx_seminars_pi1%255Bact                                 
ion%255D%3Dregister

The plugin on that page is seminars


Anyone have any idea of what is wrong?

Regards
Rene Gulager
Bitproduktion.dk