# tinker_cookbook.exceptions.WeightsAdapterError

## _class_ [**tinker_cookbook.exceptions.WeightsAdapterError**](https://github.com/thinking-machines-lab/tinker-cookbook/blob/main/tinker_cookbook/exceptions.py#L192)( _[WeightsError](https://tinker-docs.thinkingmachines.ai/cookbook/api-reference/exceptions/weightserror/), ValueError_)

Failed to convert a Tinker LoRA adapter to PEFT format.

Raised when the adapter cannot be converted for serving — e.g. the model family is not supported for adapter serving, adapter key names cannot be remapped, or tensor shapes are inconsistent. Inherits from `ValueError` because adapter conversion errors are validation failures.