Support intro
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):
32.0.2
- Operating system and version (e.g., Ubuntu 24.04):
Ubuntu 24.04
- Web server and version (e.g, Apache 2.4.25):
AIO
- Reverse proxy and version _(e.g. nginx 1.27.2)
AIO
- PHP version (e.g, 8.3):
AIO
- Is this the first time you’ve seen this error? (Yes / No):
New in last month or so
- When did this problem seem to first start?
New in last month or so
- Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
AIO
- Are you using CloudfIare, mod_security, or similar? (Yes / No)
No
Summary of the issue you are facing:
Selecting the Mail app I see the count of items in the Inbox folder but contents fails to display with “Could not open folder”.
Steps to replicate it (hint: details matter!):
-
Open nextcloud console
-
select Mail app
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.
[PHP] Error: Declaration of Psr\Log\AbstractLogger::emergency($message, array $context = ) must be compatible with Psr\Log\LoggerInterface::emergency(Stringable|string $message, array $context = ): void at /var/www/html/custom_apps/forum/vendor/psr/log/Psr/Log/AbstractLogger.php#22GET /apps/mail/api/messages?mailboxId=4&limit=20&sort=newest&view=threadedfrom 192.168.1.2 by Demetrios Tsillas at Dec 16, 2025, 9:21:24 AM
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.
PASTE
Web server / Reverse Proxy
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE
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!):
PASTE HERE
Apps
The output of occ app:list (if possible).
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.