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使用LTspice仿真出现unknown circuit node问题

使用LTspice仿真多路复用器时出现unknown circuit node:"u2:9"requested in behavioral source ,报错说未知电路节点,行为来源中要求的u2:9“。请问是什么情况导致的,要如何解决。

Unknown circuit node appears when using LTspice to simulate a multiplexer: "u2: 9" was requested in the behavior source, an error was reported that the unknown circuit was interrupted, and u2: 9 required in the behavior source. What is the cause and how can I resolve .

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