[TYPO3-project-seminars] Fatal error when unregistering because of a undefined function - solution?

Gregory Blaser grambler at bluewin.ch
Sat Jan 10 17:52:43 CET 2009

Hello all

I'm using seminars 0.7.0 and Typo 4.2.3 for a customer project, currently 
we're implementing the seminar manager in the website.

While testing the software we experienced the following error:
Fatal Error: Call to undefined method 
on line 620

This happens when we try to unregister from an event from the "My 

Can you help me out? We don't know what to do, it seems that the function 
isn't defined.

Thanks in advance!

Best Regards,

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