error in demo--simple_base.py

[HoukJangBNL]

Hi @denisenkom

I am trying to use your package to get a image from Olympus sc180 camera.
I could find the device but cannot get the image.
Whenever I call
source.RequestAcquire(0,0)
it returns "Unexpected result: 2"

I tried with your demo code--simple_base.py
I added following four lines on to our code:
asdf = TwainBase()
asdf.Initialise()
asdf.OpenScanner()
dd = asdf.AcquireNatively()

still it returns same error as following:

Exception has occurred: Exception
Unexpected result: 2
File "C:\Users\Stacker\Downloads\pytwain-master\pytwain-master\demo\simple_base.py", line 86, in _Acquire
self.SD.RequestAcquire(0, 0) # 1,1 to show scanner user interface
File "C:\Users\Stacker\Downloads\pytwain-master\pytwain-master\demo\simple_base.py", line 95, in AcquireNatively
return self._Acquire()
File "C:\Users\Stacker\Downloads\pytwain-master\pytwain-master\demo\simple_base.py", line 191, in
dd = asdf.AcquireNatively()

is there any way to overcome?