Package.getStylesheetsPath is deprecated.

[bajanReece]

Store package style sheets in the styles/ directory instead of stylesheets/ in the es-navigation package

Package.getStylesheetsPath (/Applications/Atom.app/Contents/Resources/app.asar/src/package.js:460:9)
Package.getStylesheetPaths (/Applications/Atom.app/Contents/Resources/app.asar/src/package.js:471:32)
Package.loadStylesheets (/Applications/Atom.app/Contents/Resources/app.asar/src/package.js:453:38)
<unknown> (/Applications/Atom.app/Contents/Resources/app.asar/src/package.js:185:19)
Package.measure (/Applications/Atom.app/Contents/Resources/app.asar/src/package.js:165:15)
Package.load (/Applications/Atom.app/Contents/Resources/app.asar/src/package.js:179:12)

[guybedford]

Thanks, this project is no longer actively maintained unfortunately. If you're interested in helping out and becoming a maintainer you are more than welcome.