[Plugin: Event Registration] Error in submission Please try again – The event was not updated

When I try to amend any of the information on my events I get an error message which flashes across the top of the screen for a fraction of a second and says “There was an error in your submission. please try again. The event was not updated!. …Now returning you to the even list..”

I had to record my screen and pause it just to capture the error message.

I am unable to change event details or mark any of my events as full and as such I am overbooking and being forced to refund and apologise to customers.

Can anyone help me with this error. I am using 6.00.19

https://www.ads-software.com/extend/plugins/event-registration/