extra text after expected end of preprocessing directive

ghqiloveu

 #if En_Usart1_RX

 NVIC_InitStructure.NVIC_IRQChannel=USART1_IRQn;
 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x02;
 NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x02;
 NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
 NVIC_Init(&NVIC_InitStructure);

 USART_ITConfig(USART1,USART_IT_RXNE,ENABLE); //使能串口接收中断
 
 #endif
..\SYSTEM\usart\usart.c(62): error:  #14-D: extra text after expected end of preprocessing directive
编译时报上面的错误，哪位大侠知道这是怎么回事啊？

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同问！！！