Hello aeb789,
I'm sorry to hear about the error message you're experiencing. I appreciate the troubleshooting you've already tried, including clearing the cache and using a different browser.
Kindly check as well if your browser has the latest updates and JavaScript is enabled. One other thing you can try is to use Incognito / InPrivate mode to rule out possible browser extensions that may be causing the problem.
Let me know if the issue persists after these steps, and I'll be more than happy to assist further. If you want more targeted help, you can also connect with us privately in a support case.