SOLVED: Jellyfin docker stopped working suddenly

[sapphire]

As the title and description say, I've been working on some other docker containers, but suddenly noticed jellyfin is not working anymore. I get the message ""ip-adress' refused to connect." and my homepage shows "API Error Information"
I've not used the port for jellyfin for anything else, and already did a restart of both the docker containers and the server in general and now I am a bit stuck on what it could be. Trying to learn what is going wrong, so wanted to ask first before just re-installing a jellyfin docker container.

The log file of yesterday, where I have seen the first occurrence of this error: https://pastebin.com/T25i4Qxb

Hopefully some of you can help me with this.

Edit:
I just noticed that my description is too long for what is being shown, but it says: "While working on other docker containers, Jellyfin suddenly stopped working." Or something along these lines, can't see it myself anymore either that quickly.

[theguymadmax]

Shutdown the server

In your config folder:
Rename migrations.xml to migrations.xml.bak
In system.xml, set IsStartupWizardCompleted to false  

Code:

<IsStartupWizardCompleted>false</IsStartupWizardCompleted>

Restart the server. Once it's running again, make sure to change IsStartupWizardCompleted back to true and update to the latest version; you are way behind.

[sapphire]

Thank you, that indeed solved it.

If you are willing, could you explain to me how you got that this is the problem from the logs? Kinda new to this and want to understand it a bit better if possible.

And yeah, I will update jellyfin, should probably look into updating more of my applications, don't really keep track of that.

[theguymadmax]

Known issue. Usually happens when you run out of disk space. The migration file gets corrupted. You can delete that backup file now.

Code:

System.InvalidOperationException: There is an error in XML document (0, 0).
---> System.Xml.XmlException: Root element is missing.
  at System.Xml.XmlTextReaderImpl.Throw(Exception e)
  at System.Xml.XmlTextReaderImpl.ThrowWithoutLineInfo(String res)
  at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
  at System.Xml.XmlReader.MoveToContent()
  at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderMigrationOptions.Read4_MigrationOptions()