DJ Events and Joomla 4

DJ Events and Joomla 4

Hello,

On
https://dj-extensions.com/blog/general/dj-extensions-and-joomla-4
it is written that DJ Events is ready for Joomla 4.
However, when I try to install DJ Events on Joomla 4 I get this message:
500 behavior::framework not found.

So, what goes wrong here?

Regards,
Rienk