# skfolio.exceptions.OptimizationError ### *exception* skfolio.exceptions.OptimizationError An optimizer could not compute a valid portfolio allocation. See [Failure Handling](https://skfolio.org/user_guide/optimization.html.md#optimization-failure-handling) for fallback behavior and [Updates and Failure Handling](https://skfolio.org/user_guide/online_learning.html.md#online-failure-handling) for online continuation and restart rules. #### add_note(object, /) Exception.add_note(note) – add a note to the exception #### with_traceback(object, /) Exception.with_traceback(tb) – set self._\_traceback_\_ to tb and return self.