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Getting help
In order to help you as efficiently (and quickly!) as possible, please fill in as much of the below requested information as you can.
Before clicking submit: Please check if your query is already addressed via the following resources:
- Official documentation (searchable and regularly updated)
- How to topics and FAQs
- Forum search
(Utilizing these existing resources is typically faster. It also helps reduce the load on our generous volunteers while elevating the signal to noise ratio of the forums otherwise arising from the same queries being posted repeatedly).
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can. 
The Basics
- Nextcloud Server version (e.g., 29.x.x):
35.0.0
- Operating system and version (e.g., Ubuntu 24.04):
Debian GNU/Linux 13 (trixie)
- Web server and version (e.g, Apache 2.4.25):
Apache/2.4.68
- Reverse proxy and version _(e.g. nginx 1.27.2)
N/A
- PHP version (e.g, 8.3):
PHP 8.4.24
- Is this the first time you’ve seen this error? (Yes / No):
Yes.
- When did this problem seem to first start?
Now.
- Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
Tarball
- Are you using CloudfIare, mod_security, or similar? (Yes / No)
No
Summary of the issue you are facing:
When I try to deploy recognize_backend via occ app_api:app:register recognize_backend it fails (error below). Running a test deploy through AppAPI settings page works though.
ExApp recognize_backend deployment failed. Error: Failed to pull image via "http://localhost:2375", GuzzleException occur: Server error: `POST http://localhost:2375/v1.44/images/create?fromImage=ghcr.io%2Fnextcloud%2Frecognize_backend%3A1.0.5` resulted in a `500 Internal Server Error` response
Error app_api ExApp recognize_backend deployment failed. Error: Failed to pull image via 2026-09-16T14:29:55-07:00
"http://localhost:2375", GuzzleException occur: Server error: `POST
http://localhost:2375/v1.44/images/create?fromImage=ghcr.io%2Fnextcloud%2Frecognize_backend%3A1.0.5`
resulted in a `500 Internal Server Error` response
Steps to replicate it (hint: details matter!):
-
Run
occ app_api:app:register recognize_backend -
See error.
Log entries
Nextcloud
Please provide the log entries from your Nextcloud log that are generated during the time of problem (via the Copy raw option from Administration settings->Logging screen or from your nextcloud.log located in your data directory). Feel free to use a pastebin/gist service if necessary.
{"reqId":"JDAbzaArmk3yKDrtGjFG","level":3,"time":"2026-09-16T14:30:37-07:00","remoteAddr":"","user":"--","app":"app_api","method":"","url":"--","scriptName":"/var/www/nextcloud/occ","message":"ExApp recognize_backend deployment failed. Error: Failed to pull image via \"http://localhost:2375\", GuzzleException occur: Server error: `POST http://localhost:2375/v1.44/images/create?fromImage=ghcr.io%2Fnextcloud%2Frecognize_backend%3A1.0.5` resulted in a `500 Internal Server Error` response","userAgent":"--","version":"35.0.0.10","occ_command":["/var/www/nextcloud/occ","app_api:app:register"],"data":{"app":"app_api"},"id":"6aab0ae98866b"}
Web Browser
If the problem is related to the Web interface, open your browser inspector Console and Network tabs while refreshing (reloading) and reproducing the problem. Provide any relevant output/errors here that appear.
N/A
Web server / Reverse Proxy
The output of your Apache/nginx/system log in /var/log/____:
Nothing seems related.
Configuration
Nextcloud
The output of occ config:list system or similar is best, but, if not possible, the contents of your config.php file from /path/to/nextcloud is fine (make sure to remove any identifiable information!):
{
"system": {
"debug": false,
"bulkupload.enabled": true,
"log_type": "file",
"syslog_tag": "Nextcloud",
"loglevel": 2,
"memcache.local": "\\OC\\Memcache\\APCu",
"maintenance_window_start": 8,
"preview_concurrency_all": 6,
"preview_concurrency_new": 4,
"enable_previews": true,
"preview_max_x": 2048,
"preview_max_y": 2048,
"preview_max_filesize_image": 256,
"preview_max_memory": 1024,
"enabledPreviewProviders": [
"OC\\Preview\\HEIC",
"OC\\Preview\\SVG",
"OC\\Preview\\BMP",
"OC\\Preview\\GIF",
"OC\\Preview\\JPEG",
"OC\\Preview\\Krita",
"OC\\Preview\\MarkDown",
"OC\\Preview\\MP3",
"OC\\Preview\\OpenDocument",
"OC\\Preview\\PNG",
"OC\\Preview\\TXT",
"OC\\Preview\\XBitmap",
"OC\\Preview\\Image",
"OC\\Preview\\Movie"
],
"appstoreenabled": true,
"apps_paths": [
{
"path": "\/var\/www\/nextcloud\/apps",
"url": "\/apps",
"writable": true
}
],
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"trusted_domains": [
"localhost",
"acalenderserver.ddns.net"
],
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"dbtype": "mysql",
"version": "35.0.0.10",
"overwrite.cli.url": "https:\/\/acalenderserver.ddns.net\/nextcloud\/",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbport": "",
"dbtableprefix": "oc_",
"instanceid": "***REMOVED SENSITIVE VALUE***",
"serverid": 0,
"mysql.utf8mb4": true,
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"updater.release.channel": "stable",
"installed": true,
"htaccess.RewriteBase": "\/nextcloud",
"theme": "",
"default_phone_region": "US",
"mail_smtpmode": "sendmail",
"mail_sendmailmode": "smtp",
"mail_from_address": "***REMOVED SENSITIVE VALUE***",
"mail_domain": "***REMOVED SENSITIVE VALUE***",
"mail_smtphost": "***REMOVED SENSITIVE VALUE***",
"mail_smtpport": "25",
"maintenance": false,
"memories.db.triggers.fcu": true,
"memories.exiftool": "\/var\/www\/nextcloud\/apps\/memories\/bin-ext\/exiftool-aarch64-glibc",
"memories.vod.path": "\/var\/www\/nextcloud\/apps\/memories\/bin-ext\/go-vod-aarch64",
"memories.vod.ffmpeg": "\/usr\/bin\/ffmpeg",
"memories.vod.ffprobe": "\/usr\/bin\/ffprobe",
"memories.vod.qf": 25,
"memories.vod.disable": false,
"memories.video_default_quality": "-2",
"logtimezone": "PDT"
}
}
Apps
The output of occ app:list (if possible).
Enabled:
- activity: 8.0.0
- app_api: 35.0.0
- appstore: 2.0.0-dev.0
- bruteforcesettings: 8.0.0
- calendar: 6.5.4
- circles: 35.0.0
- cloud_federation_api: 2.0.0-dev.0
- comments: 2.0.0-dev.0
- contacts: 8.9.0
- contactsinteraction: 2.0.0-dev.0
- dashboard: 8.0.0-dev.0
- dav: 2.0.0-dev.1
- deck: 1.19.0
- federatedfilesharing: 2.0.0-dev.1
- federation: 2.0.0-dev.0
- files: 3.0.0-dev.0
- files_downloadlimit: 5.3.0
- files_lock: 35.0.0
- files_pdfviewer: 8.0.0
- files_reminders: 2.0.0-dev.0
- files_sharing: 2.0.0-dev.1
- files_trashbin: 2.0.0-dev.0
- files_versions: 2.0.0-dev.0
- firstrunwizard: 8.0.0
- logreader: 8.0.0
- lookup_server_connector: 2.0.0-dev.0
- memories: 9.0.1
- nextcloud_announcements: 7.0.0
- notifications: 8.0.0
- oauth2: 2.0.0-dev.0
- office: 1.1.0
- password_policy: 7.0.0
- photos: 8.0.0
- privacy: 7.0.0
- profile: 2.0.0-dev.0
- provisioning_api: 2.0.0-dev.0
- recognize: 13.1.0
- recommendations: 8.0.0
- related_resources: 6.0.0
- serverinfo: 7.0.0
- settings: 2.0.0-dev.0
- sharebymail: 2.0.0-dev.0
- sharing: 1.0.4
- support: 7.0.0
- survey_client: 7.0.0
- systemtags: 2.0.0-dev.0
- tasks: 0.18.1
- text: 9.0.0
- theming: 3.0.0-dev.0
- twofactor_backupcodes: 2.0.0-dev.0
- twofactor_nextcloud_notification: 9.0.0
- twofactor_totp: 17.1.0
- updatenotification: 2.0.0-dev.0
- user_status: 2.0.0-dev.0
- viewer: 8.0.0
- weather_status: 2.0.0-dev.0
- webhook_listeners: 2.0.0-dev.0
- workflowengine: 3.0.0-dev.0
Disabled:
- admin_audit: 2.0.0-dev.0
- encryption: 3.0.0-dev.0
- files_external: 2.0.0-dev.0
- suspicious_login: 13.0.0
- testing: 1.23.0
- user_ldap: 2.0.0-dev.0
Tips for increasing the likelihood of a response
- Use the
preformatted textformatting option in the editor for all log entries and configuration output. - If screenshots are useful, feel free to include them.
- If possible, also include key error output in text form so it can be searched for.
- Try to edit log output only minimally (if at all) so that it can be ran through analyzers / formatters by those trying to help you.