Sometimes for troubleshooting the support engineers need the logs of the browser where the error occurred. To access the log in your browser, open the DevTools by pressing F12, then go to the Network tab. Wait for the accident to repeat.
The request that got an error is marked with red color:
The full text of the server response is on the Response tab:
Look for additional info on the Console tab:
Take screenshots and attach them to your ticket.
It might require analyzing all the request. To obtain them, right-click on any request and choose Save as HAR with Content. Attach the saved file to the ticket.