Problem with events on company

Problem with events on company

Hi Zoho team
I use zoho crm and'm beginner.

If I create an event on a existing company, everything looks good. see picture 1





An
indefinite time later, the affiliation of the event off to the company! see picture 2






If I then click on the company, the following error message! see picture 3





This is very annoying, please help me to fix this error.
Thank you