Fix ProcessLookupError

✅ Solution

The "ProcessLookupError" in autogen often arises when attempting to interact with a child process that has already terminated, leading to a mismatch between the process ID and actual running process. Ensure that child processes are properly managed and awaited after their completion using `process.wait()` (or similar methods in your multiprocessing library) to prevent attempting to access defunct processes. Alternatively, verify that the process ID you are using is still valid by checking if `process.is_alive()` before interacting further.