Error: [Errno 2] No such file or directory: 'LICENCE.rst' while upgrading to V10

I have this error when upgrading for V9 to V10. The upgrade was successful despite the error.

Is this safe to ignore?

  running install_egg_info
  running egg_info
  writing requirements to openpyxl.egg-info/requires.txt
  writing openpyxl.egg-info/PKG-INFO
  writing top-level names to openpyxl.egg-info/top_level.txt
  writing dependency_links to openpyxl.egg-info/dependency_links.txt
  reading manifest file 'openpyxl.egg-info/SOURCES.txt'
  writing manifest file 'openpyxl.egg-info/SOURCES.txt'
  Copying openpyxl.egg-info to build/bdist.linux-i686/wheel/openpyxl-2.5.10-py2.7.egg-info
  running install_scripts
  error: [Errno 2] No such file or directory: 'LICENCE.rst'
  ERROR: Failed building wheel for openpyxl erpnext

Is it a custom app?

No, I dont have any custom app.

Encountered the same error on a fresh 10 install:

INFO:bench.utils:frappe-bench/env/bin/pip install -q  -e frappe-bench/apps/frappe 
ERROR: Complete output from command /home/frappe/frappe-bench/env/bin/python -u -c 'import setuptools, tokenize;__file__='"'"'/tmp/pip-install-rwtv0z_c/openpyxl/'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);'"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d /tmp/pip-wheel-n8zw7qp7 --python-tag cp37:
ERROR: running bdist_wheel
running build
running build_py
creating build
creating build/lib
creating build/lib/openpyxl
copying openpyxl/ -> build/lib/openpyxl
Copying openpyxl.egg-info to build/bdist.linux-x86_64/wheel/openpyxl-2.5.10-py3.7.egg-info
running install_scripts
error: [Errno 2] No such file or directory: 'LICENCE.rst'