Keep on getting very many errors for the script and don't know how to fix them

Projects Programming
5 
 /*  
* Read a card using a mfrc522 reader on your SPI interface  
 * Pin layout should be as follows (on Arduino Uno):  
 * MOSI: Pin 11 / ICSP-4  
 * MISO: Pin 12 / ICSP-1  
 * SCK: Pin 13 / ISCP-3  
 * SS: Pin 10  
 * RST: Pin 5  
 */  
#include <SPI.h>  
#include <RFID.h>  
#define SS_PIN 10  
#define RST_PIN 5  
RFID rfid(SS_PIN,RST_PIN);  
int serNum[5];  
void setup(){  
 Serial.begin(9600);  
 SPI.begin();  
 rfid.init();  
}  
void loop(){  
 if(rfid.isCard()){  
  if(rfid.readCardSerial()) {  
   Serial.print(rfid.serNum[0],DEC);  
   Serial.print(" ");  
   Serial.print(rfid.serNum[1],DEC);  
   Serial.print(" ");  
   Serial.print(rfid.serNum[2],DEC);  
   Serial.print(" ");  
   Serial.print(rfid.serNum[3],DEC);  
   Serial.print(" ");  
   Serial.print(rfid.serNum[4],DEC);  
   Serial.println("");  
  }  
 }  
 rfid.halt();  
}

This is my original script.
In the rfid.halt(); line I always get the error expected unqualified-id before '.' token, and don't know what to put there.