Help!!

I am using c8051F226 and Cx51 compiler..I received this error and warning...

*** WARNING C206 IN LINE 9 OF LCD2.C: 'lcdcmd': missing function-prototype

*** ERROR C267 IN LINE 9 OF LCD2.C: 'lcdcmd': requires ANSI-style prototype

void main()
{
  lcdcmd(0x38);      //THIS IS MY LINE 9
  lcdcmd(0x0E);
  lcdcmd(0x01);
  lcdcmd(0x06);
  lcdcmd(0x80);
  lcddata('A');
  lcddata('B');
  lcddata('C');

}

I have read the error description... Can anybody tell me what's wrong with this and what should i do in order not to get this error??

Thanks