When I run `npm run dev` on a Laravel Spark v4.0.9 app, I get the following error:

    Module build failed: Error:
    
    Vue packages version mismatch:
    
    - vue@2.0.8
    - vue-template-compiler@2.2.6
    
    This may cause things to work incorrectly. Make sure to use the same version for both.
    If you are using vue-loader@&gt;=10.0, simply update vue-template-compiler.
    If you are using vue-loader@&lt;10.0 or vueify, re-installing vue-loader/vueify should bump vue-template-compiler to the latest.

My `package.json` looks like this:

    {
      &quot;private&quot;: true,
      &quot;scripts&quot;: {
        &quot;dev&quot;: &quot;cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js&quot;,
        &quot;watch&quot;: &quot;cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --watch --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js&quot;,
        &quot;hot&quot;: &quot;cross-env NODE_ENV=development node_modules/webpack-dev-server/bin/webpack-dev-server.js --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js&quot;,
        &quot;production&quot;: &quot;cross-env NODE_ENV=production node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js&quot;
      },
      &quot;dependencies&quot;: {
        &quot;axios&quot;: &quot;^0.15.2&quot;,
        &quot;bootstrap&quot;: &quot;^3.0.0&quot;,
        &quot;cross-env&quot;: &quot;^3.2.3&quot;,
        &quot;jquery&quot;: &quot;^2.1.4&quot;,
        &quot;js-cookie&quot;: &quot;^2.1.0&quot;,
        &quot;laravel-mix&quot;: &quot;0.*&quot;,
        &quot;moment&quot;: &quot;^2.10.6&quot;,
        &quot;promise&quot;: &quot;^7.1.1&quot;,
        &quot;sweetalert&quot;: &quot;^1.1.3&quot;,
        &quot;underscore&quot;: &quot;^1.8.3&quot;,
        &quot;urijs&quot;: &quot;^1.17.0&quot;,
        &quot;vue&quot;: &quot;~2.0.1&quot;,
        &quot;vue-resource&quot;: &quot;^1.2.0&quot;,
        &quot;vue-router&quot;: &quot;^2.2.1&quot;,
        &quot;vue-truncate-filter&quot;: &quot;^1.1.6&quot;,
        &quot;vuejs-datepicker&quot;: &quot;^0.6.2&quot;
      },
      &quot;devDependencies&quot;: {
        &quot;browser-sync&quot;: &quot;^2.18.8&quot;,
        &quot;browser-sync-webpack-plugin&quot;: &quot;^1.1.4&quot;
      }
    }

I have tried the following (at different times, not in order):

* deleted `node_modules` and `npm install`
* tried just running `yarn` and `yarn upgrade`
* removing `vue-loader` and reinstalling
* specifying exact versions of vue and vue-template-compiler rather than leaving it up to npm to install or yarn to figure out dependencies
* removing other non-essential packages (vue-router, vue-truncate-filter, vuejs-datepicker) and trying all of the above again
* banging my head against a wall

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How do I fix a "Vue packages version mismatch" error on Laravel Spark v4.0.9?