ValidationError: None is not of type 'string' while loading a trained model

ValidationError: None is not of type 'string' while loading a trained model: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). Failed validating 'type' in schema 'properties' 'input features' 'items' 'allOf' 23 'then' 'properties' 'preprocessing' 'properties' 'char…