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This error occurs when there is no mapping of the userGroups field in the 'g1_0' table. To fix this error, you can check the entity class mapping for the One-To-Many relationship and ensure that the userGroups field is correctly mapped. Additionally, you can check the database schema to ensure that the userGroups field is present in the corresponding table. If the mapping is correct and the field is present in the database, then you can try to regenerate the JPA entities to ensure that they are properly synchronized with the database schema.