can't install with brew

[rmormando]

I'm using my Mac to download this tool through brew but for some reason this error message pops up when I go to install:

Command:
brew install brewsci/bio/kat

Error Message:

Last 15 lines from /Users/rimo/Library/Logs/Homebrew/matplotlib/01.python3:

/opt/homebrew/opt/python@3.9/bin/python3
-c
import setuptools, tokenize
__file__ = 'setup.py'
exec(compile(getattr(tokenize, 'open', open)(__file__).read()
  .replace('\r\n', '\n'), __file__, 'exec'))
--no-user-cfg
install
--prefix=/opt/homebrew/Cellar/matplotlib/3.3.4
--install-scripts=/opt/homebrew/Cellar/matplotlib/3.3.4/bin
--install-lib=/opt/homebrew/Cellar/matplotlib/3.3.4/lib/python3.9/site-packages
--single-version-externally-managed
--record=installed.txt


If reporting this issue please do so at (not Homebrew/brew or Homebrew/homebrew-core):
  https://github.com/brewsci/homebrew-bio/issues