I installed Meteor 2.3.1 and on building the app I see:
Unable to resolve some modules: "@material-ui/core/styles/createMuiTheme" in /Users/myUser/Documents/code/src/gitlab.com/myMeteorapp/imports/client/ui/router.jsx (web.browser) If you notice problems related to these missing modules, consider running: meteor npm install --save @material-ui/core
meteor npm install --save @material-ui/core several times, and I do see
@material-ui/core in my node_modules directory:
What am I missing?