Error (12002): Port "key_down" does not exist in macrofunction "led_inst"

回答: 根据提供的引用内容，错误信息"Error (12002): Port "key_down" does not exist in macrofunction "led_inst""表明在"led_inst"宏函数中，不存在名为"key_down"的端口。这个错误可能是由于在宏函数中没有定义或者拼写错误导致的。请检查"led_inst"宏函数的定义，确保其中包含了名为"key_down"的端口。
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