Cant open Sonarr after update

[totalynobody]

Sonarr version (exact version): 3.0.10.1566
Mono version (if Sonarr is not running on Windows):
OS: Windows 11
Debug logs: Hastebin
Description of issue:
When I try to open sonarr after it updated to this version I get the following json response instead of the home page when accessing the URL localhost:8989

{
  "message": "The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters. ",
  "description": "System.FormatException: The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters. \r\n   at System.Convert.FromBase64_Decode(Char* startInputPtr, Int32 inputLength, Byte* startDestPtr, Int32 destLength)\r\n   at System.Convert.FromBase64CharPtr(Char* inputPtr, Int32 inputLength)\r\n   at System.Convert.FromBase64String(String s)\r\n   at Nancy.Authentication.Forms.FormsAuthentication.DecryptAndValidateAuthenticationCookie(String cookieValue, FormsAuthenticationConfiguration configuration)\r\n   at Nancy.Authentication.Forms.FormsAuthentication.GetAuthenticatedUserFromCookie(NancyContext context, FormsAuthenticationConfiguration configuration)\r\n   at Nancy.Authentication.Forms.FormsAuthentication.<>c__DisplayClass11_0.<GetLoadAuthenticationHook>b__0(NancyContext context)\r\n   at Nancy.BeforePipeline.<>c__DisplayClass8_0.<Wrap>b__0(NancyContext ctx, CancellationToken ct)\r\n   at Nancy.BeforePipeline.<Invoke>d__7.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at Nancy.NancyEngine.<InvokeRequestLifeCycle>d__22.MoveNext()"
}

There seems to be some issue with the database but no matter what backup I use I always get this response, I have reinstalled and tried all of the different backups I had stored going back some weeks but all give me this issue.

[jakez]

I had a similar problem. The update failed and when I reinstalled and brought in the backup, everything was borked. (The fresh install worked fine.) I ended up having to do a clean install. Our friends at Sonarr did make a 3.0.10.1567 version with the oblique bullet point “Reverted changes from develop” (whatever that means). I haven’t tried the new version yet, but perhaps this is now fixed.

[lukaszek]

This happened to me as well. Where does Ubuntu store the backups?