原因是：PCB画好之后再次更改原理图，将更改后的原理图更新至PCB的时候会导致原理图中新生成的网络和PCB中原有的网络名不匹配

解决办法：PCB---设计----网络表---编辑网络，把PCB中不匹配的网络（当前用不到的网络）删除。

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