Thread: char function call

Code:

void smssend(char *b1,char *b2)
{
  printf(gsm,"AT+CMGF=1\r");
  printf(gsm,"AT+CMGS=");
  putc(34,gsm);
  printf(gsm,"%s",b1);
  putc(34,gsm);
  printf(gsm,"\r");
  printf(gsm,"%s",b2);
  delay_ms(100);
  putc(26,gsm);
  delay_ms(200);
}
void main()
{
    while(1)
     {
        smssend("12345","JOVIN"); 
     }
}

this function shows error.how can i solve this