The error is a bit ambiguous but this is usually caused by lack of disk space.
Disk use (percent) /home
1 minute ago
25.7 %
Im getting errors everytime i load the frontend
https://hassio.local:8123/frontend_latest/app-653721033e62144d6a686dab25ef1429.js:2:12049 Uncaught TypeError: Cannot read property 'computeStateName' of undefined
also getting this
18-05-30 03:30:32 ERROR (MainThread) [hassio.api.proxy] Client error on API stream request Cannot connect to host 172.30.32.1:8123 ssl:None [Connection refused].
Perhaps it has nothing to do with it, but are you using Chrome 66? Since this version it it more strict on using ssl etc.
Yep I’m using latest version 66.0.3359.181 (just updated)
I can still acess HA all ok no problems other than the error log being created, the second SSL error seems to have gone now…
Think i found the problem
to do with custom UI
disabled this and no errors
Yup as mentioned in the blog post all Custom UI’s need to be updated 
I had issue with blank state cards but after I updated Custom UI - Release 20180528 everything works.
In fact, I am very impressed at how fast the front end is now particularity the logbook and history. I don’t see any delays now when previously it would be 5 secs.
Thanks
Agree; it feels really snappy now!
I cant install the latest version.
Getting this error:
18-05-31 09:31:05 ERROR (SyncWorker_2) [hassio.docker.interface] Can’t install homeassistant/raspberrypi3-homeassistant:0.70.0 -> 404 Client Error: Not Found (“no such image: homeassistant/raspberrypi3-homeassistant:0.70.0: No such image: homeassistant/raspberrypi3-homeassistant:0.70.0”).
Disk space used is only 30% so that should not be the problem
Upgraded successfully, however the developer tools just hangs when I try to access them. Can’t access services, states, configuration, etc, just get the spinning circle and nothing happens. Everything else seems to be working.
Try incognito, if it works there then you need to clear your cache. I had to clear cache on all of my devices after updating to 0.70
That did it, thank you.
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Since 0.69.1 and 0.70 my Hass.io tool bar is just a blank screen? I thought upgrading to 0.70 would resolve it (using SSH connection and upgrading with hassio homeassistant update)
Has anyone else experienced this? Any ideas how to fix it?
I’ve run in incognito mode to check if its got anything to do with cache issues but still get a blank screen.
Search the forum.
For now, it only works with Chrome browser.
Fix is coming.
so should i start installing from scratch or there is some solution, as i see im not only one with this issue…
18-06-02 08:26:13 INFO (SyncWorker_15) [hassio.docker.interface] Update docker 0.69.1 with homeassistant/raspberrypi3-homeassistant:0.70.1
18-06-02 08:26:13 INFO (SyncWorker_15) [hassio.docker.interface] Pull image homeassistant/raspberrypi3-homeassistant tag 0.70.1.
18-06-02 08:26:19 ERROR (SyncWorker_15) [hassio.docker.interface] Can’t install homeassistant/raspberrypi3-homeassistant:0.70.1 → 404 Client Error: Not Found (“no such image: homeassistant/raspberrypi3-homeassistant:0.70.1: No such image: homeassistant/raspberrypi3-homeassistant:0.70.1”).
I’m having a strange problem after upgrade. Sometimes all my devices suddenly turn on. Any idea what is happening?
Since I had some issues with the rfxtrx component, I finally decided to upgrade Hassio and see if that changed something.
The Hassio 0.70.1 upgrade has issues with serial devices, too. Not just the plain Docker container.
I used to use the serial-by-id path to my device, but this device no longer is available inside the container. I have to use a /dev/ttyUSB0 or USB1 path from this moment forward.
same for me still have issues with serveral serail devices. It is adressed in those tickets:
There is also a workaround