After having updated python 3.5 to python 3.6 with aconda, we find this error: if you use pip install command to install python packeages, you may get error: ERROR: Error checking for conflicts. In this tutorial, we will discuss how to fix this error.
From thie error, we can find pyparsing package is not found.
Install pyparsing package with conda
conda install -c conda-forge pyparsing
We install python pyparing library with conda command first and make pyparsing exists.
Check this error is fixed or not
We can pip install a python library again.
pip install pymupdf
Then we find this conflict error is fixed.