This error suggests that the custom datasync operation is attempting to update a constituent profile field that is not enabled. The field name(s) [FIELD_NAME] mentioned in the error would need to be enabled before the operation could run and completes successfully.

If your custom code was recently changed there is a likelihood that an additional new field(s) [FIELD_NAME] was included on your custom code but was never enabled on site settings. Contact Luminate Support to have the listed fields enabled for you.