@datajoely I believe it is because the catalog.yaml in the Quickstart specifies the same file path for two different datasets:

data_science.active_modelling_pipeline.regressor:
  type: pickle.PickleDataSet
  filepath: data/06_models/regressor.pickle
  versioned: true
  layer: models
...
data_science.candidate_modelling_pipeline.regressor:
  type: pickle.PickleDataSet
  filepath: data/06_models/regressor.pickle
  versioned: true
  layer: models

That cannot work... right?