I have noticed that similar issue on occasion. Generally reopening browser cleared it... else a simple stop and restart of Node-Red got me going again.
Update of what? Node-Red or the Dashboard or both?
Dashboard(1 week ago). But I can't turn the system off and on, it hurts me. My system is an active program.
I deleted the cookies and tried again. Unfortunately it doesn't.
I have set up separate Node-RED instances for my Dashboard(s) and the "core", communicating via MQTT. Makes such circumstances a bit easier, plus, you can update them independently.
I use it the same way, but I have some counters, so restarting is a bit risky. Will rebooting fix the problem??
Since it's a UI issue, I don't think restarting Node-RED or even rebooting would do any good. I'd go with a reload (F5) of the Browser tab running the editor. If that doesn't fix it, it could be a bug or regression.
As for the counters there a multiple solutions, so they wouldn't be lost after a restart:
- you could setup the file-based context store
- use MQTT retained topics
After upgrading the dashboard you must clear the cache in the browser using the browser menus to do that. Then force a full page reload.
I deleted all cookies and tried from different browsers. It didn't happen again.
What kind of mistake? I don't have any nodes currently not running.
Mistake? I don't quite follow what you mean... 
Deleting cookies is not the same as clearing the cache.
So is it all working now?
Yesterday it fixed itself without doing anything. Now I am facing the same error again.
I added 4-5 "texts". Again I got the same error.
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