Usually this is some type of loading issue. Please try:
At the top right, clicking the profile picuture/initials and logging out, then login again
Disabling any ad blockers
Try another PC/mobile device to see if the issue is device or account specific
If possible, test on another network to see if there is something being blocked at your network level (some enterprise networks block certain URLs)
If the issue persists, lease can you take a screenshot of the oops error page and share it with our support.