Fix FileNotFoundError

✅ Solution

FileNotFoundError in pytorch-lightning often arises when file paths used for saving checkpoints, configurations, or logs are invalid or the destination directory doesn't exist. To fix this, ensure all specified directories exist before writing to them, using `os.makedirs(path, exist_ok=True)` to create them if needed; also, validate that file paths are correctly formed, especially when dealing with absolute paths or paths with special characters on different operating systems. Consider using `os.path.join` for robust path construction.