Past events when click in admin Event Manager> Events give error 0 Class 'JS

I hope you can explain or help why I am getting this problem

I have an issue with past events. I wanted first to update the url in redirects so I went to Joomla redirects but oddly none of the past events URLs are listed, which was a bit odd, because they must fall on 404 error pages (at least I would imagine this being normal).  
So next I search in the past events in the admin of Event booking, to find the url that needs to be redirected but when I click on a past event at1
www.example.com/nl/administrator/index.p...tbooking&view=events
It shows :An error has occurred.

0 Class 'JString' not found

Events Booking does not use JString class anymore, so it is very likely it comes from a third party plugin

You can submit a support ticket sending us super admin account of your site so that I can check and tell you the plugin which causes this error

Regards,

Tuan

Hello

The error causes by Google Structured Data - Event Booking plugin. For now, I disabled the plugin to prevent error

You should report this issue to the developer of the plugin and ask him to fix it (or update your site to latest version of the extension if you are using outdated one)

Regards,

Tuan

Okay, I will notify Tassos.gr! Thanks, for alerting me to that.

OK. Hope he will fix the issue soon !

Regards,

Tuan