此拓扑包含一个无效的可选节点。可能的原因是输出和输入的数量错误，或可选节点位于段的开头或结尾。

Message in Chinese (Simplified) (中文(简体))

Unlocalized message

The topology contains an invalid optional node. Possible reasons are incorrect number of outputs and inputs or optional node is at the beginning or end of a segment.

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