wpa_supplicant error when usb stick tries to connect to AP

[Malte Gell]

I also want to add another error message I see, when the wpa_supplicant is 
called, it also gives this error:

ifup wlan0

wlan0     name: FRITZ!WLAN USB Stick N 
    wlan0     starting wpa_supplicant      
ioctl[SIOCSIWPMKSA]: Invalid argument      
ioctl[SIOCSIWPMKSA]: Invalid argument  

So, i have two error messages, the one above and when trying to connect to the 
AP "disconnect event - remove keys"....