Having problems running Sudo Python read.py

[Grahamrich1]

I have been getting an error "can't open device: No such file or directory" which I have nailed down to the line

pi@raspberrypi:~/gr_programs/RFID/SPI-Py/MFRC522-python $ sudo python read.py
Opening file.
importing MFRC533.
Opening signal
Signal open
MIFAREREADER =
can't open device: No such file or directory

This is my modified .py

print "Opening file."
print "importing MFRC533."
import MFRC522
print "Opening signal"
import signal
print "Signal open"
continue_reading = True
print "MIFAREREADER ="
MIFAREReader = MFRC522.MFRC522()

print "Def card AtoC ="
cardA = [5,74,28,185,234]
cardB = [83,164,247,164,164]
cardC = [20,38,121,207,132]

print "Def end read ="
def end_read(signal, frame):
global continue_reading
continue_reading = False
print "Ctrl+C captured, ending read."
MIFAREReader.GPIO_CLEEN()

signal.signal(signal.SIGINT, end_read)

Any idea on what I doing wrong?