"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-07 05:21:36.957969
"""

```python
from typing import Callable, Any, Dict


class FallbackExecutor:
    """
    A class for executing tasks with fallbacks in case of errors.
    """

    def __init__(self):
        self.fallbacks: Dict[str, Callable[[], Any]] = {}

    def add_fallback(self, task_name: str, fallback_function: Callable[[], Any]) -> None:
        """
        Add a fallback function for a given task.

        :param task_name: The name of the task.
        :param fallback_function: The function to be used as a fallback.
        """
        self.fallbacks[task_name] = fallback_function

    def execute_with_fallback(self, task_name: str) -> Any:
        """
        Execute a task and handle errors by using a fallback if necessary.

        :param task_name: The name of the task to be executed.
        :return: The result of the task execution or the fallback function.
        :raises KeyError: If no fallback is defined for the given task.
        """
        try:
            # Simulate task execution
            return self.execute_task(task_name)
        except Exception as e:
            print(f"Error occurred during {task_name} execution: {e}")
            if task_name in self.fallbacks:
                return self.fallbacks[task_name]()
            else:
                raise KeyError(f"No fallback defined for task: {task_name}")

    def execute_task(self, task_name: str) -> Any:
        """
        Placeholder method to simulate actual task execution.
        In a real-world scenario, this would be where the actual logic is implemented.

        :param task_name: The name of the task.
        :return: Result of the task execution or raises an error if it fails.
        """
        # Simulate task failure
        raise ValueError("Task failed")

    def __call__(self, task_name: str) -> Any:
        return self.execute_with_fallback(task_name)


# Example usage
def fetch_data() -> Any:
    """Fetch data from a remote source."""
    # Simulated fetching logic
    raise Exception("Failed to fetch data")


def log_error() -> None:
    """Log the error to a file or external system."""
    print("Logging the error...")


if __name__ == "__main__":
    fallback_executor = FallbackExecutor()
    fallback_executor.add_fallback("fetch_data", fetch_data)
    fallback_executor.add_fallback("log_error", log_error)

    try:
        result = fallback_executor("fetch_data")
        if result is not None:
            print(f"Data fetched: {result}")
        else:
            print("Fetching data failed.")
    except KeyError as e:
        print(e)


```