This code blows up on load with this error:

dagster._core.errors.DagsterInvalidDefinitionError: io manager with key 'lake_io_manager' required by output 'transformed_data' of op 'transformer_op'' was not provided. Please provide a <class 'dagster._core.storage.io_manager.IOManagerDefinition'> to key 'lake_io_manager', or change the required key to one of the following keys which points to an <class 'dagster._core.storage.io_manager.IOManagerDefinition'>: ['io_manager', 'output_notebook_io_manager']

Why would it work for the first (target-extractor) op/graph and not the second? All i want to do is to be able to write custom parquet files for some of my ops...is there some type based uniqueness to ops? something else?