I can see following error in syslog each time I access there webui.

open() "/usr/local/emhttp/webGui/webComps/unraid.min.js" failed

 

The file doesn't exist in server after I ssh into my server.

Part of unraid.net  Best to ask in that support thread.  https://forums.unraid.net/topic/104018-my-servers-early-access-plugin

 

Thank you, I now remove the plugin and the issue is gone.

It sounds like something went wrong while the plugin was being installed, haven't seen that before. If you try the plugin again, copy/paste any messages that display while the plugin is being installed and we can take a look.

Hello, I tried to install the plugin again and it's same. The log shows everything's fine.

You aren't giving me much to go on  Nobody has reported this error before so there isn't an obvious "just do X" type of response available.

 

 

If you still have a copy of what the installation screen screen showed it would be helpful to see it.

 

Please upload your diagnostics (from Tools -> Diagnostics) as well.