H5P Content does not appear on page


a customer of ours is using the H5P WordPress plugin for his site.

If they add a H5P element to their site, they get those two console error (see screenshot) and the H5P content just doesn't appear.

We already tried disabling all plugins except for H5P, updating the plugin to the newest version and updating the PHP version of the site, but that didn't change anything.

Is this a known problem and is there a solution for this?

Best regards

Gerry Zeller

Actually I have the same problem , I'm using Apolearn and the activity doesn´t appear on my page. Can you help me please? 
Best resgards 

Rudy Robert