Why do errors occur when using some functions? Don't understand

Why do errors occur when using some functions? Don’t understand

The current error points encountered are: 1. An error occurs when modifying the user name and attempting to save it. 2. Some buttons for loading the function will say that a problem is currently encountered

We were in the middle of a backend migration. Which is now completed.
Please re-authenticate, and if you still experience problems, let us know.