# tinker_cookbook.exceptions.AllTrajectoriesFailedError

## *class* [**tinker_cookbook.exceptions.AllTrajectoriesFailedError**](https://github.com/thinking-machines-lab/tinker-cookbook/blob/main/tinker_cookbook/exceptions.py#L151)(*[TrainingError](https://tinker-docs.thinkingmachines.ai/cookbook/api-reference/exceptions/trainingerror/index.md)*)

All trajectories in a rollout group failed.

Caught internally by the rollout pipeline to skip the affected group rather than crash the training run.