Elixir.ready is not a function

[deadlance]

When I run gulp, I get the following -

/home/jlevan/PhpstormProjects/WebFiler2/node_modules/laravel-elixir-vueify/index.js:3
Elixir.ready(() => {
       ^

TypeError: Elixir.ready is not a function
    at Object.<anonymous> (/home/jlevan/PhpstormProjects/WebFiler2/node_modules/laravel-elixir-vueify/index.js:3:8)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at Object.<anonymous> (/home/jlevan/PhpstormProjects/WebFiler2/gulpfile.js:2:14)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)

I just ran a npm install laravel-elixir-vueify --save-dev