Login error > Warning: Cannot modify header information - headers already sent by.....

So I've seen this come up before. Not that often but it happened again.

Pulling up the login screen and at the top are two lines of error output. Once you log in, the screen is white and these lines are at the top.

Warning: parse_ini_file(state/var.ini): failed to open stream: No such file or directory in /usr/local/emhttp/login.php on line 11

Warning: session_start(): Cannot start session when headers already sent in /usr/local/emhttp/plugins/dynamix/include/.login.php on line 8

Warning: session_start(): Cannot start session when headers already sent in /usr/local/emhttp/plugins/dynamix/include/.login.php on line 214

Warning: session_regenerate_id(): Cannot regenerate session id - session is not active in /usr/local/emhttp/plugins/dynamix/include/.login.php on line 217

Warning: Cannot modify header information - headers already sent by (output started at /usr/local/emhttp/login.php:11) in /usr/local/emhttp/plugins/dynamix/include/.login.php on line 222

SSH still works and I was able to create a diagnostics. I looked around and there was mention that this happens durint the appdata backup process. I looked at my backups and I noticed that they had not been runnign for a few days now. The last backup 'attempt' was on the 19th and was showing '-error' in the filename. 

This is the content of the AppDataBackup plugin;

[19.02.2023 03:00:01] Backup of appData starting. This may take awhile
[19.02.2023 03:00:01] Not stopping : Not started! [ / Up 3 hours]
[19.02.2023 03:00:01] Not stopping : Not started! [ / Up 3 hours (healthy)]
[19.02.2023 03:00:01] Not stopping : Not started! [ / Up 3 hours]
[19.02.2023 03:00:01] Not stopping : Not started! [ / Up 3 hours (healthy)]
[19.02.2023 03:00:01] Not stopping : Not started! [ / Up 3 hours]
[19.02.2023 03:00:01] Not stopping : Not started! [ / Up 3 hours]
[19.02.2023 03:00:01] Not stopping : Not started! [ / Up 3 hours]
[19.02.2023 03:00:01] Not stopping : Not started! [ / Created]
[19.02.2023 03:00:01] Not stopping : Not started! [ / Up 3 hours]
[19.02.2023 03:00:01] Not stopping : Not started! [ / Up 3 hours]
[19.02.2023 03:00:01] Not stopping : Not started! [ / Up 3 hours]
[19.02.2023 03:00:01] Not stopping : Not started! [ / Up 3 hours]
[19.02.2023 03:00:01] Not stopping : Not started! [ / Exited (0) 3 hours ago]
[19.02.2023 03:00:01] Not stopping : Not started! [ / Up 3 hours]
[19.02.2023 03:00:01] Not stopping : Not started! [ / Up 3 hours]
[19.02.2023 03:00:01] Not stopping : Not started! [ / Exited (137) 3 hours ago]
[19.02.2023 03:00:01] Not stopping : Not started! [ / Exited (143) 3 hours ago]
[19.02.2023 03:00:01] Not stopping : Not started! [ / Up 3 hours (healthy)]
[19.02.2023 03:00:01] Stopping binhex-prowlarr...  done! (took 1 seconds)
[19.02.2023 03:00:02] Stopping binhex-urbackup...  done! (took 2 seconds)
[19.02.2023 03:00:04] Backing Up appData from /mnt/cache/appdata/ to /mnt/remotes/192.168.200.89_Backups/KNOXX/appdatabu/[email protected]
[19.02.2023 03:00:04] Separate archives enabled!
[19.02.2023 03:00:04] Ignoring: .
[19.02.2023 03:00:04] Ignoring: ..
[19.02.2023 03:00:04] Backing Up: binhex-prowlarr
[19.02.2023 03:00:04] Verifying Backup binhex-prowlarr
[19.02.2023 03:00:04] Backing Up: binhex-urbackup
[19.02.2023 03:00:14] Verifying Backup binhex-urbackup
[19.02.2023 03:00:17] Backing Up: dashy
[19.02.2023 03:00:17] Verifying Backup dashy
[19.02.2023 03:00:17] Backing Up: FileBot
[19.02.2023 03:00:17] Verifying Backup FileBot
[19.02.2023 03:00:17] Backing Up: homeassistant
[19.02.2023 03:00:22] Verifying Backup homeassistant
[19.02.2023 03:00:23] Backing Up: Home-Assistant-Core
[19.02.2023 03:00:23] Verifying Backup Home-Assistant-Core
[19.02.2023 03:00:23] Backing Up: mariadb
[19.02.2023 03:00:46] Verifying Backup mariadb
[19.02.2023 03:00:51] Backing Up: nextcloud
[19.02.2023 03:01:06] Verifying Backup nextcloud
[19.02.2023 03:01:08] Backing Up: Nginx-Proxy-Manager-Official
[19.02.2023 03:01:08] Verifying Backup Nginx-Proxy-Manager-Official
[19.02.2023 03:01:08] Backing Up: pihole
[19.02.2023 03:01:46] Verifying Backup pihole
[19.02.2023 03:01:52] Backing Up: radarr-extended
[19.02.2023 03:04:53] Verifying Backup radarr-extended
[19.02.2023 03:05:30] Backing Up: radarr-extended-3d
[19.02.2023 03:05:32] Verifying Backup radarr-extended-3d
[19.02.2023 03:05:33] Backing Up: seedsync
[19.02.2023 03:05:33] Verifying Backup seedsync
[19.02.2023 03:05:33] Backing Up: sonarr-extended
[19.02.2023 03:05:59] Verifying Backup sonarr-extended
[19.02.2023 03:06:04] Backing Up: TubeArchivist
[19.02.2023 03:06:05] Verifying Backup TubeArchivist
[19.02.2023 03:06:05] Backing Up: vaultwarden
[19.02.2023 03:06:05] Verifying Backup vaultwarden
[19.02.2023 03:06:05] done
[19.02.2023 03:06:05] Starting binhex-urbackup... (try #1)  Error while starting container! - Code: Server error
[19.02.2023 03:06:10] Starting binhex-urbackup... (try #2)  Error while starting container! - Code: Server error
[19.02.2023 03:06:16] Starting binhex-urbackup... (try #3)  Error while starting container! - Code: Server error
[19.02.2023 03:06:16] Container did not started after multiple tries, skipping.
[19.02.2023 03:06:18] Starting binhex-prowlarr... (try #1)  Error while starting container! - Code: Server error
[19.02.2023 03:06:23] Starting binhex-prowlarr... (try #2)  Error while starting container! - Code: Server error
[19.02.2023 03:06:28] Starting binhex-prowlarr... (try #3)  Error while starting container! - Code: Server error
[19.02.2023 03:06:28] Container did not started after multiple tries, skipping.
[19.02.2023 03:06:37] A error occurred somewhere. Not deleting old backup sets of appdata
[19.02.2023 03:06:37] Backup / Restore Completed

knoxx-diagnostics-20230324-0939.zip