No description page from Module Basic

I have a local testing website with Joomla 3.7.4 and JEM 2.2.1 as new installation.
JEM Module Basic is defined in right-column position and works good. In this module the title is defined as clickable. The URL of a clickable title is (for example): http://localhost/franciscus/component/jem/event/111-woord-en-communieviering.
Clicking the title leaves the website and gives a next screen (see screenshot) with this failure: '0 Call to undefined method JemOutput::eventDateTime()'. It has to present the description in the content-area as in this website .

How to solve this problem?

Hi, sorry I (we) were in holydays.
I will try to reproduce your issue.

Hi Jan,

I played around on my test server but I can't reproduce this problem.

But I agree the error: The class JemOutput does not have a member eventDateTime(). You should search within all files to see where this is called. I'm sure that's not an original JEM file.

I just now discovered my (local) problem has disappeared. I have been on a holiday for a week. Maybe that's the solution for more problems?
Jan.

I am happy, that the problem is solved. I like holidays too.
Pace e bene