Failure: incident_activity_parties: Cascade link type 'NoCascade' is invalid for Delete.

Solutions found from Microsoft forum.

If rollups installing/uninstalling does not helps, try exucute this sql on your _mscrm database:

UPDATE [dbo].[RelationshipView] SET [CascadeDelete] = 2
WHERE [IsCustomRelationship] = 0 AND [CascadeDelete] = 0