"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-08 03:57:34.543270
"""

```python
from typing import Callable, Any

class FallbackExecutor:
    """
    A class that provides a fallback mechanism for executing functions.
    If the primary function fails to execute due to an error, it attempts to use a secondary backup function.

    :param primary_function: The main function to be executed.
    :param backup_function: An optional fallback function to be used if the primary function fails.
    """

    def __init__(self, primary_function: Callable[..., Any], backup_function: Callable[..., Any] = None):
        self.primary_function = primary_function
        self.backup_function = backup_function

    def execute(self, *args, **kwargs) -> Any:
        """
        Attempts to execute the primary function. If an error occurs during execution,
        falls back to executing the secondary backup function if provided.

        :param args: Positional arguments to pass to the functions.
        :param kwargs: Keyword arguments to pass to the functions.
        :return: The result of the executed function or None if both fail.
        """
        try:
            return self.primary_function(*args, **kwargs)
        except Exception as e:
            if self.backup_function is not None:
                print(f"Primary function failed with error: {e}")
                return self.backup_function(*args, **kwargs)
            else:
                print("No backup function available. Execution failed.")
                return None

# Example usage
def primary_add(a: int, b: int) -> int:
    """ Adds two numbers """
    if a < 0 or b < 0:
        raise ValueError("Numbers must be non-negative")
    return a + b

def backup_subtract(a: int, b: int) -> int:
    """ Subtracts the second number from the first """
    return a - b

fallback_executor = FallbackExecutor(primary_add, backup_function=backup_subtract)

# Successful execution
result1 = fallback_executor.execute(5, 3)
print(f"Addition result: {result1}")

# Error recovery execution
try:
    result2 = primary_add(-1, 2)  # This should raise an error
except Exception as e:
    print(f"Error caught during addition: {e}")
    
final_result = fallback_executor.execute(5, -3)
print(f"Fallback subtraction result: {final_result}")
```

This example demonstrates a simple `FallbackExecutor` class that can be used to handle limited error recovery in Python functions. The `primary_add` function is the main one and includes a check for non-negative inputs which could fail with an exception. If this happens, the `backup_subtract` function is called as a fallback mechanism.