wlanctl-ng ... ifstate=enable returns "implementation_failure"

Hi folks,

  I have a RTlink2500 Wlan usb adapter in Suse 9(kernel 2.6.5-7.97),trying
to set up wireles networking using linux-wlan-ng-0.2.1-pre26.
  As Readme said,'make' and 'make install 'is done without problems!
  then the follow:

linux:~ # modprobe prism2_usb prism2_doreset=1

linux:~ # wlanctl-ng wlan0 lnxreq_ifstate ifstate=enable
message=lnxreq_ifstate
  ifstate=enable
  resultcode=implementation_failure

 /var/log/message:
May 20 11:12:59 linux kernel: usb 1-2: new full speed USB device using
address 7
May 20 11:12:59 linux kernel: usb 1-2: Product: USB2.0 WLAN
May 20 11:12:59 linux kernel: usb 1-2: Manufacturer: ZyDAS
May 20 11:12:59 linux kernel: usb 1-2: SerialNumber: USB2.0 WLAN
May 20 11:13:01 linux [powersaved][2368]: resmgr: server response code 200
May 20 11:13:08 linux last message repeated 3 times

May 20 11:13:11 linux kernel: prism2_usb: unsupported module, tainting
kernel.
May 20 11:13:11 linux kernel: prism2usb_init: prism2_usb.o: 0.2.1-pre26
Loaded
May 20 11:13:11 linux kernel: prism2usb_init: dev_info is: prism2_usb
May 20 11:13:11 linux kernel: hfa384x_corereset: hfa384x_corereset not
supported on USB on 2.5/2.6 kernels.
May 20 11:13:11 linux kernel: usbcore: registered new driver prism2_usb
May 20 11:13:11 linux [powersaved][2368]: resmgr: server response code 200

May 20 11:13:33 linux last message repeated 9 times
May 20 11:13:35 linux kernel: hfa384x_drvr_start: Fatal, failed to submit
RX URB, result=-90
May 20 11:13:35 linux kernel: prism2sta_ifstate: hfa384x_drvr_start()
failed,result=-90
May 20 11:13:36 linux [powersaved][2368]: resmgr: server response code 200

any ideas?

thanks!