import os
import asyncio

from autogen_ext.runtimes.grpc import GrpcWorkerAgentRuntimeHost


class Config:
    HOST = "0.0.0.0"
    PORT = "50051"


async def main():
    """
    Initializes and starts the gRPC server GrpcWorkerAgentRuntimeHost.
    """
    config = Config()
    address = f"{config.HOST}:{config.PORT}"
    host = GrpcWorkerAgentRuntimeHost(address)
    host.start()
    print(f"Distributed Host is now running and listening for connection at {address}")

    try:
        print(f"Detected OS: {os.name}")
        # wait for the service to stop
        if os.name == "nt":
            # on windows, the signal is not available, so we wait for a new event
            print("windows")
            await asyncio.Event().wait()
        else:
            print("other os")
            await host.stop_when_signal()
    except KeyboardInterrupt:
        print("Stopping service due to KeyboardInterrupt..")
    finally:
        await host.stop()
        print("Stopping host")


if __name__ == "__main__":
    asyncio.run(main())

Traceback (most recent call last):
return self._loop.run_until_complete(task)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/asyncio/base_events.py", line 654, in run_until_complete
return future.result()
^^^^^^^^^^^^^^^
File "/app/main.py", line 40, in main
await host.stop()
File "/usr/local/lib/python3.11/site-packages/autogen_ext/runtimes/grpc/_worker_runtime_host.py", line 42, in stop
raise RuntimeError("Host runtime is not started.")
RuntimeError: Host runtime is not started.