New Matrix won't start with url_preview_enabled

[codev]

Matrix died overnight for us after the 1.145.0 update (Synapse 1.163.0) with this in the logs every 15 seconds:

Synapse 1.163.0 needs beautifulsoup4 for url-preview, but it is not installed

I fixed it for now by editing configs/homeserver.yaml to switch url_preview_enable off.

Could you add beautiful soup to the package so URL previews will work again?

[james]

Hello @codev and welcome to the Cloudron community forum

Good catch!

[fbartels]

I just noticed that the latest Matrix update also left my install in a "not responding" state (btw. there does not seem to be a notification for this).

Seems to be the same error as codev:

2026-10-15T09:56:22.676Z shell: apptask: /usr/bin/sudo --non-interactive /home/yellowtent/box/src/scripts/configurelogrotate.sh add a19662e3-62af-4022-bf11-f9dabaef48ae /tmp/a19662e3-62af-4022-bf11-f9dabaef48ae.logrotate
2026-10-15T09:56:22.701Z apptask: startApp: starting container
2026-10-15T09:56:22.928Z tasks: updating task 25633 with: {"percent":90,"message":"Configuring reverse proxy"}
2026-10-15T09:56:22.930Z tasks: updating task 25633 with: {"percent":100,"message":"Done"}
2026-10-15T09:56:22.935Z tasks: setCompleted - 25633: {"result":null,"error":null,"percent":100}
2026-10-15T09:56:22.935Z tasks: updating task 25633 with: {"completed":true,"result":null,"error":null,"percent":100}
2026-10-15T09:56:22.936Z taskworker: Task took 42.679 seconds
2026-10-15T09:56:22.937Z Exiting with code 0
2026-10-15T09:56:22Z ==> Ensure we log to console
2026-10-15T09:56:23Z ==> Configuring OIDC auth
2026-10-15T09:56:23Z ==> Configuring synapse
2026-10-15T09:56:23Z ==> Fixing permissions
2026-10-15T09:56:23Z ==> Starting synapse
2026-10-15T09:56:25Z "read_config",
2026-10-15T09:56:25Z )
2026-10-15T09:56:25Z )
2026-10-15T09:56:25Z ^
2026-10-15T09:56:25Z ^
2026-10-15T09:56:25Z ^^^^^^^^^^^^
2026-10-15T09:56:25Z ^^^^^^^^^^^^^^
2026-10-15T09:56:25Z ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2026-10-15T09:56:25Z ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2026-10-15T09:56:25Z allow_secrets_in_config=allow_secrets_in_config,
2026-10-15T09:56:25Z allow_secrets_in_config=config_args.secrets_in_config,
2026-10-15T09:56:25Z config_dict,
2026-10-15T09:56:25Z synapse.util.check_dependencies.DependencyException: ['beautifulsoup4']
2026-10-15T09:56:25Z check_requirements("url-preview")
2026-10-15T09:56:25Z main()
2026-10-15T09:56:25Z obj.parse_config_dict(
2026-10-15T09:56:25Z self.invoke_all(
2026-10-15T09:56:25Z ~~~~^^
2026-10-15T09:56:25Z ~~~~~~~~~~~~~~~^
2026-10-15T09:56:25Z ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
2026-10-15T09:56:25Z ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^
2026-10-15T09:56:25Z ~~~~~~~~~~~~~~~~~~~~~^
2026-10-15T09:56:25Z ~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
2026-10-15T09:56:25Z ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2026-10-15T09:56:25Z "Synapse Homeserver", argv_options
2026-10-15T09:56:25Z )
2026-10-15T09:56:25Z ...<2 lines>...
2026-10-15T09:56:25Z ...<3 lines>...
2026-10-15T09:56:25Z ==> Ensure we log to console
2026-10-15T09:56:25Z File "/app/code/env/lib/python3.14/site-packages/synapse/app/homeserver.py", line 333, in load_or_generate_config
2026-10-15T09:56:25Z File "/app/code/env/lib/python3.14/site-packages/synapse/app/homeserver.py", line 478, in main
2026-10-15T09:56:25Z File "/app/code/env/lib/python3.14/site-packages/synapse/app/homeserver.py", line 505, in <module>
2026-10-15T09:56:25Z File "/app/code/env/lib/python3.14/site-packages/synapse/config/_base.py", line 438, in invoke_all
2026-10-15T09:56:25Z File "/app/code/env/lib/python3.14/site-packages/synapse/config/_base.py", line 595, in load_config
2026-10-15T09:56:25Z File "/app/code/env/lib/python3.14/site-packages/synapse/config/_base.py", line 676, in load_config_with_parser
2026-10-15T09:56:25Z File "/app/code/env/lib/python3.14/site-packages/synapse/config/_base.py", line 899, in load_or_generate_config
2026-10-15T09:56:25Z File "/app/code/env/lib/python3.14/site-packages/synapse/config/_base.py", line 919, in parse_config_dict
2026-10-15T09:56:25Z File "/app/code/env/lib/python3.14/site-packages/synapse/config/repository.py", line 287, in read_config
2026-10-15T09:56:25Z File "/app/code/env/lib/python3.14/site-packages/synapse/util/check_dependencies.py", line 336, in check_requirements
2026-10-15T09:56:25Z File "<frozen runpy>", line 198, in _run_module_as_main
2026-10-15T09:56:25Z File "<frozen runpy>", line 88, in _run_code
2026-10-15T09:56:25Z Synapse 1.163.0 needs beautifulsoup4 for url-preview, but it is not installed
2026-10-15T09:56:25Z Traceback (most recent call last):
2026-10-15T09:56:25Z config = HomeServerConfig.load_or_generate_config(
2026-10-15T09:56:25Z homeserver_config = load_or_generate_config(sys.argv[1:])
2026-10-15T09:56:25Z obj, _ = cls.load_config_with_parser(config_parser, argv_options)
2026-10-15T09:56:25Z raise DependencyException(deps_unfulfilled)
2026-10-15T09:56:25Z res[config_class.section] = getattr(config, func_name)(*args, **kwargs)
2026-10-15T09:56:25Z return cls.load_config(description, argv_options)

[james]

Hello @matrix-synapse-element users
An app update is available that fixes this issue.
https://forum.cloudron.io/post/131077

[timconsidine]

Thank you for the quick resolution @james

[msbt]

much obliged, thanks @james and @codev

[codev]

So fast! That's great, thanks, got the server back up and running with url previews.