ModuleNotFoundError:No module named 'iio'

I am working on a virtual guest machine, and I want to use GNU radio with IIO devices, so I followed the steps in

https://wiki.analog.com/resources/tools-software/linux-software/gnuradio#compiling_the_gr-iio_blocks_for_your_pc

Yet, I have this message saying that the  module 'iio' can not be found when I tried to run my flowgraph in GNU radio companion.

I have the libiio and gr-iio library, and I also installed swig because the GNU radio version I have is 3.8, and the Python version is 3.8.2. 

I have looked up all the similar questions that other folks had, but I could not seem to figure this out. 

Please help.

Thanks in advance.