You just need g.setFont("7x11Numeric7Seg",4); not g.setFont("Font7x11Numeric7Seg",4); :)
g.setFont("7x11Numeric7Seg",4);
g.setFont("Font7x11Numeric7Seg",4);
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
You just need
g.setFont("7x11Numeric7Seg",4);
notg.setFont("Font7x11Numeric7Seg",4);
:)