BlinkStick Pro Python code error

I tried to use my WS2821B led strip with python and BlinkStick Pro. I was able to once configure BlinkStick successfully but second time i tried the same commands (.set_mode() and .set_color()) this comes up:

Python 2.7.10 (default, [date and time]) [MSC v.1500 32 bit (Intel)] on win32
Type “help”, “copyright”, “credits” or “license” for more information.
from blinkstick import blinkstick
led = blinkstick.find_first()
led.set_mode(2)
Traceback (most recent call last):
File “(stdin)”, line 1, in (module)
AttributeError: ‘NoneType’ object has no attribute ‘set_mode’

For me it looks like that the find_first fails. So you´ve got “none” and “none” has no attribut. First of all I would try to replug the device.

Yep, the problem was that my computer didn’t recognize BlinkStick for some reason, but now it works perfeclty!