module 'nio' has no attribute 'open_file'

[e-erfani]

Hi,

I am trying to read grib2 files using nio. In the past, I was able to do so, but now I receive above error message, when I want to use the nio.open_file command. The nio was installed successfully using pip3 install nio; and it was imported with no issue in Python3. Other system versions are provided below. Appreciate your guide.
nio version: 3.4.2
python version: 3.6
I am on a Unix machine.

[ml-xia]

I meet the same error message , Do you solve that problem yet?