It looks like you installed the package with both pip and uv, so I'd expect that at least one of them installed it in the right place. However, let's assume you are using primarily uv, in this case, can you try the following command:

uv run chainlit run app.py

(PS: Sorry, unfortunately I don't have a computer that can run Windows, and I also have unfortunately no experience with it; however, I think it should probably work via the uv run chainlit run app.py command; it looks like it's merely an installation issue.)

Hi Sir, thanks again for your respond

Following the yours advice, I tried running the Chainlit app using:

uv run chainlit run app.py

This command was meant to:

• Use the uv environment manager to run Chainlit
• Ensure the correct environment and installed packages are used
• Avoid import errors by relying on uv's internal resolution

⚠️ First Result

I received the following error:

Error: Invalid value: File does not exist: app.py

This happened because I ran the command from the root folder:

LLMs-from-scratch/

…but the actual app.py file is located deeper inside:

llms_from_scratch/ch07/06_user_interface/app.py

🧠 Adjusted Attempt

I corrected the path and ran:

uv run chainlit run llms_from_scratch/ch07/06_user_interface/app.py

This time, Chainlit found the file, but the app crashed with:

ModuleNotFoundError: No module named 'llms_from_scratch.ch04'

Despite having installed the package using both:

pip install -e .

and

uv add . --dev

…the import still failed. I also tried manually adjusting sys.path, but nothing worked reliably.

After several attempts of troubleshooting, I’ve decided to rebuild the project from scratch using Conda instead of uv. I’ll clean up the environments, reinstall dependencies, and restructure the setup to see if that resolves the import issues and makes the workflow more stable on Windows.

I’m hopeful that starting fresh with Conda will give me better control and clarity over the environment and package paths.

Thank you once again

in case you want to retry on Windows with uv, the commands below are similar to what you've done but to make sure.
First delete your venv folder and make sure you are in the correct directory: root of your repo folder in your terminal or your IDE (like vscode, pycharm) terminal

I think it's still powershell by default? and run the commands in the image (make sure you see .venv once activated for the last command

After that if you do pip list or uv pip list you should be able to see in the list "llms-from-scratch" installed
Hope that helps otherwise Idk either what could have gone wrong

Edit: My bad I forgot uv will install the first python version it sees if not specified, if you have already python 3.11 it should be fine otherwise replace the first command with uv venv .venv --python 3.11 or uv venv --python 3.11 same thing

Arg, it's a bummer that it turns out to be so frustrating to get to work in your case. I would maybe sugges

I think you are potentially running into two things at once:

1. running Chainlit from the wrong working directory, and
2. importing subpackages

I would maybe suggest giving it another try, starting with a fresh installation / venv.

E.g,.

# from the repo ROOT (the folder that contains pyproject.toml)
Remove-Item -Recurse -Force .venv -ErrorAction Ignore
uv venv --python 3.11
.\.venv\Scripts\Activate.ps1

# Remove any previous installs in this venv just in case
uv pip uninstall -y llms-from-scratch llms_from_scratch 2>$null

# Install the local package (this installs pkg/llms_from_scratch)
uv pip install -e .

And then try chainlit again:

uv run chainlit run llms_from_scratch/ch07/06_user_interface/app.py