Hi ,I hv written following code for serial transmission of Port1 data to PC from 89c51 . i am compiling following code in side51 cmpiler but getting the error message " error during assembly " in output screen...plz see what shud be the change in the code to successfully send the data

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#include <Philips8xC31-51-80C51Fx-80C51Rx+.h>  
#include <standard.h>   
#define PORT1 P1    // P1 recieves the ADC data and transfers it to serial port //
unsigned char mybyte ;  //intermediate variable//
void serial_send(unsigned char mybyte ) ;
void main (void)
{       TMOD = 0x20;   
        SCON = 0x50;
        TH1  = 0xFD;
        TR1 = 1 ;
        TI = 0  ;
while(1)
   {  mybyte = PORT1 ;   // from port 1 to mybyte variable //
      serial_send(mybyte) ;
   }
}
   void serial_send(unsigned char mybyte) 
 {     SBUF = mybyte ;
       while(TI)
        TI = 0 ;
  }
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