Hey Richard,
Interesting, thats a very dauting error message. It looks like its a mismatch with Python versions. Tucked away down the bottom of the PyMakr install is a common issues section with a supposed fix.
Commands and copy-able stuff:
echo "python=/usr/bin/python2.7" >> ~/.atom/.apmrc
apm install
~/.atom/packages/pymakr
Let us know how you go with that!
