Matchmaking just stopped working!

So I had matchmaking all set up in my custom UI, but now it won't connect. I just get the following logs:

System.FormatException: FAILURE Returned from server: failed GetNetworkDB for appId=415901
at UnityEngine.Networking.Match.Response.Parse (System.Object obj) [0x0003e] in C:\buildslave\unity\build\Runtime\Networking\Managed\UNETInterface.cs:214
at UnityEngine.Networking.Match.ListMatchResponse.Parse (System.Object obj) [0x00000] in...

Matchmaking just stopped working!