"This Chalice Dungeon has been deleted from the server"?

I just created my first Chalice Dungeon, and I've been working on beating it. I haven't beat it yet.

But now when I check the Chalice Dungeon info, it says this message in red at the bottom.

Why? What's it do?

Is it still playable? Then don't mind the message.

If it became unplayable, I guess the Glyph got corrupt or something. Try to make a new one. If it was made with a Chalice without the word "root" in it you will get the same dungeon anyway.

EDIT: I looked some more into it since I got the same message: Is it possible that your dungeon is more then a week/few weeks old? If so, it probably means because the dungeon is created some time ago, the game threw it away from the server. To make the Glyph available for a new dungeon. This means you can still play the dungeon, but none can join you since you're playing SinglePlayer when playing in the deleted dungeon (atleast thats what I think).

The reason why I think that, is because yesterday I saw some posts about people who lost their character after they stopped playing for a few weeks while their character was still inside the dungeon. And they all had the same message as you on their Chalice dungeon.