since updating to the beta 4.7 I got this everywhere in Liuci interface; not sure if you are ware.
Maybe try to clear your browser cache? Or try to configure in private/incognito mode and see if it persists.
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Does a reset of your device solve those issues?
why new firmware so many problems?
You are using a beta firmware.
also you may want to check if your connection to the router is fine.
This error often happen if your connection was disconnected to the router and the requested callback cannot be found.
It can also happen if the client webpage thinks to be logged in but the login has been expired on the webserver, then a different browser or incoginito mode helps like suggested by @packetmonkey or deleting browsers history.
4.7.4 or 4.7.7 is beta firmware?