Message
The configured schema must contain the same number of fields as the source dataset.
Description
The specified schema is incompatible with the source dataset because there is a mismatched number of fields specified. For example, the specified schema is considered incompatible if it has 10 fields but the source dataset has 11 fields.
Solution
Delete the currently specified schema using the Fields parameter on the input dataset. Click Configure schema to infer the schema again. Data Pipelines will provide an updated schema that will account for any fields that were added or removed from the source dataset.