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Hi @Aditya Tomar You seem to be running OPAL on Windows, that’s not something we really tested for. Gunicorn (the server framework) OPAL uses is not compatible with Windows Quick search on the topic brings this: https://stackoverflow.com/questions/62788628/modulenotfounderror-no-module-named-fcntl Which suggests trying waitress to Gunicorn You can try that, but I’d recommend you instead run OPAL within a Unix docker container on Windows

Okay okay I will try with unix then

Actually their might be a quick fix here for the CLI, Try replacing the contents of

"c:\users\hp pc\appdata\local\programs\python\python37\lib\site-packages\opal_client\cli.py"

With:

import os
import sys

import typer
from fastapi.applications import FastAPI
from typer.main import Typer
from typer.models import Context

# Add parent path to use local src as package for tests
root_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), os.path.pardir))
sys.path.append(root_dir)

from opal_client.config import opal_client_config
from opal_common.cli.docs import MainTexts
from opal_common.cli.typer_app import get_typer_app
from opal_common.config import opal_common_config


app = get_typer_app()


@app.command()
def run(engine_type: str = typer.Option("uvicron", help="uvicorn or gunicorn")):
    """Run the client as a deamon."""
    typer.echo(f"-- Starting OPAL client (with {engine_type}) --")
    from opal_common.corn_utils import run_gunicorn, run_uvicorn
    if engine_type == "gunicorn":
        app: FastAPI
        from opal_client.main import app

        run_gunicorn(
            app,
            opal_client_config.CLIENT_API_SERVER_WORKER_COUNT,
            host=opal_client_config.CLIENT_API_SERVER_HOST,
            port=opal_client_config.CLIENT_API_SERVER_PORT,
        )
    else:
        run_uvicorn(
            "opal_client.main:app",
            workers=opal_client_config.CLIENT_API_SERVER_WORKER_COUNT,
            host=opal_client_config.CLIENT_API_SERVER_HOST,
            port=opal_client_config.CLIENT_API_SERVER_PORT,
        )


@app.command()
def print_config():
    """To test config values, print the configuration parsed from ENV and
    CMD."""
    typer.echo("Printing configuration values")
    typer.echo(str(opal_client_config))
    typer.echo(str(opal_common_config))


def cli():
    main_texts = MainTexts("OPAL-CLIENT", "client")

    def on_start(ctx: Context, **kwargs):
        if ctx.invoked_subcommand is None or ctx.invoked_subcommand == "run":
            typer.secho(main_texts.header, bold=True, fg=typer.colors.MAGENTA)
        if ctx.invoked_subcommand is None:
            typer.echo(ctx.get_usage())
            typer.echo(main_texts.docs)

    opal_client_config.cli(
        [opal_common_config], typer_app=app, help=main_texts.docs, on_start=on_start
    )


if __name__ == "__main__":
    cli()

Okay okay I will try this also and docker one Thanks for the help 👍