ORA-40243
incorrect schema for string
Cause
The centroid table or initial centroid table whose name being specified in the settings did not match the required schema. A centroid table and an initial centroid table should have the schema (centroid_id, centroid_vector).
Action
Modify the schema of the centroid table or initial centroid table so that it matches with the ones provided here in the Cause section, and also as provided in the documentation.