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bug: ERROR: No matching distribution found for msgpack>=1.1.0 #6179
Description
Duplicate Check
- I have searched the opened issues and there are no duplicates
Describe the bug
flet doctor Flet 0.80.5 on Linux 6.17.0-14-generic (x86_64) Python 3.12.3 (/home/user/flet/littletest/venv/bin/python)
The simple possible program - see below is unable to create.
and got that error.
Does this also happen today with programs that were previously easy to create?
Code sample
Code
import flet as ft
def main(page: ft.Page):
page.add(ft.Text(value="Hello, world!"))
ft.run(main)To reproduce
create a folder
make a venv
activate the venv then:
pip install 'flet[all]'
run
flet doctor
flet create
place the code inside the main.py
testing with
flet run
works on the desktop then
try to build it with:
flet build apk
got the error
Expected behavior
No response
Screenshots / Videos
Captures
[Upload media here]
Operating System
Linux
Operating system details
Linux thinkpad 6.17.0-14-generic #14~24.04.1-Ubuntu
Flet version
Flet 0.80.5
Regression
Yes, it used to work in a previous Flet version (please specify the version in additional details)
Suggestions
No response
Logs
Logs
flet build apk --verbose
[21:19:40] Run subprocess: ['/home/user/flutter/3.38.7/bin/flutter', '--version', '--no-version-check', '--suppress-analytics']
Flutter executable: /home/user/flutter/3.38.7/bin/flutter
Dart executable: /home/user/flutter/3.38.7/bin/dart
JDK installed at /home/user/java/17.0.13+11
Configuring Flutter's path to JDK
Run subprocess: ['/home/user/flutter/3.38.7/bin/flutter', 'config', '--no-version-check', '--suppress-analytics', '--jdk-dir=/home/user/java/17.0.13+11']
Setting "jdk-dir" value to "/home/user/java/17.0.13+11".
You may need to restart any open editors for them to read new settings.
JDK installed ✅
Android SDK installation found at /home/volker/Android/sdk
Android SDK package "cmdline-tools;latest" is already installed
Android SDK package "platform-tools" is already installed
Android SDK package "platforms;android-35" is already installed
Android SDK package "build-tools;34.0.0" is already installed
Android SDK installed ✅
Run subprocess: ['/home/user/flutter/3.38.7/bin/dart', 'run', '--suppress-analytics', 'serious_python:main', 'package',
'/home/user/flet/littletest/src', '--platform', 'Android', '-r', 'flet>=0.80.5', '--exclude', 'build', '--cleanup-packages']
Running build hooks...Running build hooks...Running package command
Extra PyPi indexes: [https://pypi.flet.dev]
Created temp directory: /tmp/serious_python_tempFZWCOI
Copying Python app from /home/user/flet/littletest/src to a temp directory
Configured Android/arm64-v8a platform with sitecustomize.py
Installing [flet>=0.80.5] with pip command to /home/user/flet/littletest/build/site-packages/arm64-v8a
[21:19:42] ERROR: Could not find a version that satisfies the requirement msgpack>=1.1.0 (from flet) (from versions: none)
ERROR: No matching distribution found for msgpack>=1.1.0
<_io.TextIOWrapper name=5 encoding='utf-8'>
Run subprocess: ['/home/user/flutter/3.38.7/bin/flutter', 'doctor', '--no-version-check', '--suppress-analytics']
[21:19:45] Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.38.7, on Ubuntu 24.04.4 LTS 6.17.0-14-generic, locale de_DE.UTF-8)
[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.0)
[✗] Chrome - develop for the web (Cannot find Chrome executable at google-chrome)
! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.
[✓] Linux toolchain - develop for Linux desktop
[✓] Connected device (2 available)
[✓] Network resources
! Doctor found issues in 1 category.
Additional details
No response
Activity
FeodorFitsner commentedon Feb 17, 2026
Check if you can access https://pypi.flet.dev from your machine.
VoHeCode commentedon Feb 17, 2026
normaly from any browser ? yes
and inside the project foldet, where ich start flet build apk ,
i do: curl -s --head --request GET https://pypi.flet.dev
and get : HTTP/2 200
so yes i could access
or this:
pip index versions msgpack --index-url https://pypi.flet.dev/ returns ERROR: No matching distribution found for msgpack – so the package is missing from the Flet PyPI index entirely.
VoHeCode commentedon Feb 21, 2026
Any news? I got some: As i change my code to :
and the pyproject.toml to :
I can run the desktop version with
flet runand build an apk without errors, but as i start that under android i got a screen with: ```Traceback (most recent call last):
File "", line 77, in
ModuleNotFoundError: No module named 'certifi'
ndonkoHenri commentedon Feb 21, 2026
This is wrong:
Use Flet package directly/only: https://pypi.org/project/flet/
VoHeCode commentedon Feb 21, 2026
Why? I don't want to write that this is exactly what I want to do, no, I would like to build with 0.80.5. But I can't get it to work (anymore). And this is the only way to get a flet build apk without errors! I've been trying to fix this for days (OMG, even with AI). I've tried everything except using a different computer. I'm stuck at the moment. My programmes run perfectly under Linux, but I can't build any new ones for Android. It always fails when calling the msgpack dependency. Attempts to use it locally fail because it seems to always be fetched externally in ‘flet build’.
ndonkoHenri commentedon Feb 21, 2026
Here is simple app, which I am able to build on all platforms, as seen here. So, I dont think issue comes from our side tbh.
Can you try deleting the build directory (or run with
--clear-cache) and retrying? (without flet-core)VoHeCode commentedon Feb 25, 2026
I always start a new build with emty build folder! That's not the point. May it's on my side but i don't know how to check that/fix that. As if i "install" flet with pip and set the version 0.28.3 or 0.80.5 in the pyproject.toml there is no locale thing that i could "reset" "install" or change. Am i right with that? And it has worked weeks ago with version 0.80.0, with nothing changed meanwhile. Any suggestions?
ndonkoHenri commentedon Feb 25, 2026
Alright lets try this: install uv (Python package manager), and run this command to build the app instead:
This basically runs the build command in an isolated virtual environment, with the latest Flet version v0.81.0.
Also, have only
fletin your pyproject.toml dependencies.ndonkoHenri commentedon Aug 17, 2026
Closing as resolved.
msgpackwas never missing from pypi.flet.dev; the Android/iOS wheels have been there all along. The failure was your user-site packages (~/.local/lib/python3.12/site-packages) leaking into the isolated Python thatserious_pythonruns pip with, which shadowed its bundled pip and broke platform-tag resolution —msgpackjust happened to be the first dependency needing a platform-specific wheel.Fixed in
serious_python0.9.11 (serious-python#195) and rolled into the build templates, including the 0.80.5 one. If you're on an older build cache, rebuild with--clear-cacheto pick it up.