Lefse-plot_res.py error

I have been trying to use lefse through a newly created conda environment with python v 2.7, as lefse was not compatible with the 3.0 version.
I have been stuck at the results step, as I am getting the following error:

miniconda3/envs/lefse/lib/python2.7/site-packages/matplotlib/artist.py", line 881, in _update_property raise AttributeError('Unknown property %s' % k) AttributeError: Unknown property axis_bgcolor

According to my understanding, the matplotlib tool in python is not compatible with the version of lefse or python and thus throwing out this error.
How can I proceed with resolving this? I have tried updating matplotlib and it has not worked!
I am just starting out with python based programs and still a newb! please help me figure this out

Hello, did you solve it? I got this error as well.