Could not find Elm compiler "elm-make". Is it installed?

[nkhine]

i get this errro:

Serverless: Bundling with Webpack...
Could not find Elm compiler "elm-make". Is it installed?
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! elm-serverless-demo@1.0.0 start: `serverless offline`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the elm-serverless-demo@1.0.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/khinester/.npm/_logs/2018-10-16T14_07_16_901Z-debug.log

 elm --version                                     ✔  1180  15:13:06
0.19.0

i installed elm as per https://gist.github.com/evancz/442b56717b528f913d1717f2342a295d