Chart Viewer not running

[GGBonehead]

I just installed a clean version of the /Nachtzuster/ version to a new Pi4B. All is well except there are no charts.
As you can see from a screen grab of the Services page, Char Viewer shows this: Chart Viewer (activating [auto-restart])

If I stop and start or restart, I get the following:

● chart_viewer.service - BirdNET-Pi Chart Viewer Service
Loaded: loaded (/etc/systemd/system/chart_viewer.service; enabled; preset: enabled)
Active: activating (auto-restart) (Result: signal) since Wed 2025-07-30 17:53:45 BST; 1s ago
Process: 9162 ExecStart=/home/birder/BirdNET-Pi/birdnet/bin/python3 /usr/local/bin/daily_plot.py --daemon --sleep 2 (code=killed, signal=ILL)
Main PID: 9162 (code=killed, signal=ILL)
CPU: 1.654s

Is there an easy way to diagnose/fix or reinstall Chart Viewer?

Any help greatly appreciated.

[GGBonehead]

Just an addition... I tried a clean install of Bookworm and BirdNET on another memory card, and that has the same issue. Does that mean it's a wider issue?

[ghost]

I had the same issue. Can you ssh to your pi and run : python3 scripts/daily_plot.py and post the output?
I had issues with various failed imports
I had to edit templates/chart_viewer.service to edit the path to python3

ExecStart=python3 /usr/local/bin/daily_plot.py --daemon --sleep 2

Runs OK now after installing missing dependencies.

[GGBonehead]

Thanks. Output from the script:

Traceback (most recent call last):
File "/home/birder/BirdNET-Pi/scripts/daily_plot.py", line 8, in
import matplotlib.font_manager as font_manager
ModuleNotFoundError: No module named 'matplotlib'

[ghost]

Same as me. You will need to install missing modules manually using pip install matplotlib then run it again then install the next missing
I had to
pip install matplotlib seaborn
pip install apprise

Maybe some others too.
I think this is because when the install script is trying to install the packages in requirements.txt it fails on the first line so progress stops.

Edit: Right track, wrong cure it seems. I reinstalled it all eventually. Removing pyarrow with birdnet/bin/pip uninstall pyarrow made it work. Seems to work without it, with some missing functionality I guess,

[GGBonehead]

I appreciate your help, but I'm not an expert. I tried running your suggested pip installs but got errors way beyond my pay grade :)

I may have to wait for an update or official fix.

error: externally-managed-environment
× This environment is externally managed
╰─> To install Python packages system-wide, try apt install
python3-xyz, where xyz is the package you are trying to
install.

If you wish to install a non-Debian-packaged Python package,
create a virtual environment using python3 -m venv path/to/venv.
Then use path/to/venv/bin/python and path/to/venv/bin/pip. Make
sure you have python3-full installed.

For more information visit http://rptl.io/venv

[1000000v]

See Nachtzuster#406 for a workaround. The problem lies in new version of pyarrow.

[jworrin]

Thank you so much! I just installed Birdnet-pi for the first time this week and have been struggling with the daily charts as well as the stats. Your workaround fixed both.

The daily charts was failing with an illegal instruction that was being thrown with the pandas import. I am guessing panadas, or one of its transient dependencies, is using pyarrow? Thanks again :)

[1000000v]

I am guessing panadas, or one of its transient dependencies, is using pyarrow?

Based on the dependency tree it's streamlit package:

$ . /home/jsmith/BirdNET-Pi/birdnet/bin/activate
$ pip install pydeptree
# ...
$ pipdeptree -r -p pyarrow
pyarrow==20.0.0
└── streamlit==1.19.0 [requires: pyarrow>=4.0]

1MV

[GGBonehead]

For anyone else having this problem, it's now fixed. It seems pyarrow has been updated so running the following command has fixed all charts and graphs:

./scripts/update_birdnet.sh

Hope this helps.