[Tutor] File open error

[Magnus Wirström]

Hi

I'm trying to open a file with open() but i get this error i cant put my 
finger how to fix. Code looks like this.
    ...
    def OnStartaButton(self, event):
        print "Startade ", ctime(time())
        self.startOP.SetLabel(ctime(time()))
        self.staticText7.SetLabel("Läser konfiguration.")
        config = open("backup.conf", "r")
        config.readline()  #discard line
        config.readline()  #discard line
        filsource=config.readline()
        config.readline()   #discard line
        fildest=config.readline()
        config.close()
       
        self.staticText7.SetLabel("Läser katalogstruktur.")
    ...
When i'm executing it i get this error (runtime)

Traceback (most recent call last):
  File "C:\python\boa\backup\backupwin.py", line 135, in OnStartaButton
    config = open("backup.conf", "r")
TypeError: an integer is required

what does it want ? i can't figur it out ... the weird thing is that if 
i put the exactly same line (the open line) in the python shell it 
works. So why not in my program ?7
Thanks
Magnus