sys.argv[1] IndexError: list index out of range

Traceback (most recent call last):
  File "C:\Python26\Network Folder\client_side.py", line 8, in <module>
    FILE = sys.argv[1]
IndexError: list index out of range

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# USAGE: python FileSender.py [file]

import sys, socket

HOST = 'localhost'
CPORT = 9091
MPORT = 9090
FILE = sys.argv[1]

cs = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
cs.connect((HOST, CPORT))
cs.send("SEND " + FILE)
cs.close()

ms = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
ms.connect((HOST, MPORT))

f = open(FILE, "rb")
data = f.read()
f.close()

ms.send(data)
ms.close()

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# USAGE: python FileReciever.py

import socket, time, string, sys, urlparse
from threading import *

#------------------------------------------------------------------------

class StreamHandler ( Thread ):

    def __init__( this ):
        Thread.__init__( this )

    def run(this):
        this.process()

    def bindmsock( this ):
        this.msock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        this.msock.bind(('', 9090))
        this.msock.listen(1)
        print '[Media] Listening on port 9090'

    def acceptmsock( this ):
        this.mconn, this.maddr = this.msock.accept()
        print '[Media] Got connection from', this.maddr
    
    def bindcsock( this ):
        this.csock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        this.csock.bind(('', 9091))
        this.csock.listen(1)
        print '[Control] Listening on port 9091'

    def acceptcsock( this ):
        this.cconn, this.maddr = this.csock.accept()
        print '[Control] Got connection from', this.maddr
        
        while 1:
            data = this.cconn.recv(1024)
            if not data: break
            if data[0:4] == "SEND": this.filename = data[5:]
            print '[Control] Getting ready to receive "%s"' % this.filename
            break

    def transfer( this ):
        print '[Media] Starting media transfer for "%s"' % this.filename

        f = open(this.filename,"wb")
        while 1:
            data = this.mconn.recv(1024)
            if not data: break
            f.write(data)
        f.close()

        print '[Media] Got "%s"' % this.filename
        print '[Media] Closing media transfer for "%s"' % this.filename
    
    def close( this ):
        this.cconn.close()
        this.csock.close()
        this.mconn.close()
        this.msock.close()

    def process( this ):
        while 1:
            this.bindcsock()
            this.acceptcsock()
            this.bindmsock()
            this.acceptmsock()
            this.transfer()
            this.close()

#------------------------------------------------------------------------

s = StreamHandler()
s.start()

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