Anki add-on updates are crashing via Flatpak

Anki Add-ons
1

Hi,

I’m not sure whether this is a problem specifically with Anki or with the set of add-ons I’m using. I have Anki 25.09.05 installed on Fedora Workstation 43. For some time now, the system has been reporting that there is an update available for the “Anki MCP Server” add-on. Attempting to update this add-on results in the error shown below. It seems the problem is the absence of the rpds.rpds module in the Flatpak environment supplied with Anki. Should I report this issue as a bug in the official GitHub repository for the Anki project, or for the Anki MCP Server add-on?

Anki 26.05 (e64c6b1a) (ao)
Python 3.13.13 Qt 6.10.3 PyQt 6.10.2
Platform: Linux-7.0.12-101.fc43.x86_64-x86_64-with-glibc2.42

Traceback (most recent call last):
  File "/app/lib/python3.13/site-packages/aqt/taskman.py", line 152, in raise_exception
    raise exception
  File "/app/lib/python3.13/site-packages/aqt/taskman.py", line 148, in _on_closures_pending
    closure()
    ~~~~~~~^^
  File "/app/lib/python3.13/site-packages/aqt/taskman.py", line 88, in <lambda>
    lambda future: self.run_on_main(lambda: on_done(future))
                                            ~~~~~~~^^^^^^^^
  File "/app/lib/python3.13/site-packages/aqt/addons.py", line 1279, in _download_done
    future.result()
    ~~~~~~~~~~~~~^^
  File "/usr/lib/python3.13/concurrent/futures/_base.py", line 449, in result
    return self.__get_result()
           ~~~~~~~~~~~~~~~~~^^
  File "/usr/lib/python3.13/concurrent/futures/_base.py", line 401, in __get_result
    raise self._exception
  File "/usr/lib/python3.13/concurrent/futures/thread.py", line 59, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/app/lib/python3.13/site-packages/aqt/addons.py", line 1256, in <lambda>
    lambda: self._download_all(force_enable), self._download_done
            ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
  File "/app/lib/python3.13/site-packages/aqt/addons.py", line 1272, in _download_all
    download_and_install_addon(
    ~~~~~~~~~~~~~~~~~~~~~~~~~~^
        self.mgr, self.client, id, force_enable=force_enable
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/app/lib/python3.13/site-packages/aqt/addons.py", line 1217, in download_and_install_addon
    result2 = mgr.install(
        io.BytesIO(result.data), manifest=manifest, force_enable=force_enable
    )
  File "/app/lib/python3.13/site-packages/aqt/addons.py", line 461, in install
    file_manifest = self.readManifestFile(zfile)
  File "/app/lib/python3.13/site-packages/aqt/addons.py", line 431, in readManifestFile
    import jsonschema
  File "/home/piotrek/.var/app/net.ankiweb.Anki/data/Anki2/addons21/124672614/vendor/shared/jsonschema/__init__.py", line 13, in <module>
    from jsonschema._format import FormatChecker
  File "/home/piotrek/.var/app/net.ankiweb.Anki/data/Anki2/addons21/124672614/vendor/shared/jsonschema/_format.py", line 11, in <module>
    from jsonschema.exceptions import FormatError
  File "/home/piotrek/.var/app/net.ankiweb.Anki/data/Anki2/addons21/124672614/vendor/shared/jsonschema/exceptions.py", line 15, in <module>
    from referencing.exceptions import Unresolvable as _Unresolvable
  File "/home/piotrek/.var/app/net.ankiweb.Anki/data/Anki2/addons21/124672614/vendor/shared/referencing/__init__.py", line 5, in <module>
    from referencing._core import Anchor, Registry, Resource, Specification
  File "/home/piotrek/.var/app/net.ankiweb.Anki/data/Anki2/addons21/124672614/vendor/shared/referencing/_core.py", line 9, in <module>
    from rpds import HashTrieMap, HashTrieSet, List
  File "/home/piotrek/.var/app/net.ankiweb.Anki/data/Anki2/addons21/124672614/vendor/shared/rpds/__init__.py", line 1, in <module>
    from .rpds import *
ModuleNotFoundError: No module named 'rpds.rpds'

===Add-ons (active)===
(add-on provided name [Add-on folder, installed at, version, is config changed])
Anki MCP Server ['124672614', 2026-06-18T15:08, 'None', '']
AnkiConnect ['2055492159', 2025-11-09T20:40, 'None', '']
Minimize to tray ['85158043', 2025-11-16T20:38, 'None', mod]

===IDs of active AnkiWeb add-ons===
124672614 2055492159 85158043

===Add-ons (inactive)===
(add-on provided name [Add-on folder, installed at, version, is config changed])

Best regards,
Piotr Minkina

2

Is it

or

?

3

Looks like an add-on fix was released: rpds ModuleNotFoundError on Windows / Linux-aarch64 / macOS-Intel — vendored bundle ships wrong-platform binaries (exposed by Anki 26.05) · Issue #54 · ankimcp/anki-mcp-server-addon · GitHub

Note that the Flatpak build is not official. If you can’t reproduce the issue with the official build linked at https://apps.ankiweb.net you’ll need to report this to the Flatpak maintainers.

4

You’re right, I have Anki ⁨26.05 (e64c6b1a)⁩. I’m sorry for the mistake.

5

Unfortunately, this fix doesn’t solve the problem for me, but thanks for the tip. I’ve added my name to the issue report with the maintainer of this add-on, and if necessary, I’ll report the problem to the maintainers of the Flatpak package afterwards.