Similar to this thread, I am unable to access the Settings tab from the side ribbon, however my issue is when I use a web browser - when I use my mobile device, I can access it without an issue.
This started manfesting after updating both core and OS, which initially resulted in the web interface not loading at all, although I could get to the CLI successfully. Restarting supervisor gave me watchdog errors, and nothing was solved through several manual reboots (I run hassio baremetal on a Lenovo Tiny 710q)
I finally rebuilt the core from the CLI, which finally worked to get the web interface back up, but now I can’t access the settings page from the web interface. I’ve tried resetting the web cache as recommended in the thread I linked at the top of this post, but no luck. I also deleted my entire cache for my browser vs just the page, tried logging in on a different browser, even creating a new user with admin access, all have the same result.
Edit: I should mention that now my companion app isn’t finding my server at all.
I tried automatically finding it, which didn’t work, so I typed in the url manually (the default http://homeassistant.local:8123/) and it logged me in successfully, however, unlike previously, the settings screen is now mirroring the same error I get from the web UI
Does your HA have a static/fixed IP or dynamically/assigned by DHCP in your router?
Do you know that IP and have you tried connecting to that http://IP:8123 ?
Same problem happened either on android app and Firefox web browser on a windows PC due to a problem related to an I\O problem with system hardware or hard drive.
After that problem, all automations and data are in a read only mode.
After a reboot, all was fixed, but I can see only desktop sections and the first graph that appearing when you click on a sensor, but if I want to see more to select a different time interval or I try to see settings, notifications and other, appear the error.
On browser I’ve pushed F5 when the error appear and all seems to be resolved.
On android app there’s no way to refresh the page and the errors persist.
(Also on android browser all working well after a page refresh)
I think that is only a cached page problem and nothing more.
I encountered the same problem. My dashboard, calendar, integrations, and so on wouldn’t open. Everything was the same as at TS screen (except the page title kept changing). And CTRL+F5 didn’t work for me. I had to go to browser DevTools and check “Disable cache” in the “Network” tab, then refresh the page, and then everything worked. After thsis I uncheck “Disable cache”, and this worked now.
