ORA-13065: cannot delete a child layer with a parent layer
Cause: A call was made to delete a feature layer which has a dependent layer defined on it.
Action: Make sure that all dependent feature layers are deleted before deleting the current feature layer.
ORA-13065错误表明尝试删除一个父层时，其下子层仍存在。官方解释是：尝试删除一个图层，但在其下一个子层仍存在。