Error in EventON (Fortbildungen) Open / Edit.

My problem is as follows.
I updated the current Avada and EventON to WP 6.4.2.
Before and after I can go to the post under training and this message appears.
Before a critical error was generated.

Any idea?

Contact the item author for the free support


I bought the product through Themeforest together with Avada.

Forum is general purposes but not for item support. Contact Avada support.

OK Thanks