NPM run dev 遇到的報錯！vue 和 vue-template-compiler 版本不一致

1. npm run dev 時報錯：

   ERROR in ./resources/assets/js/components/steps.vue
   Module Error (from ./node_modules/vue-loader/lib/index.js):
   Vue packages version mismatch:
   - vue@2.6.5
   - vue-template-compiler@2.6.6
   This may cause things to work incorrectly. Make sure to use the same version for both.
   If you are using vue-loader@>=10.0, simply update vue-template-compiler.
   If you are using vue-loader@<10.0 or vueify, re-installing vue-loader/vueify should bump vue-template-compiler to the latest.
   @ ./resources/assets/js/app.js 12:13-46
   @ multi ./resources/assets/js/app.js ./resources/assets/sass/app.scss
   ERROR in ./resources/assets/js/components/steps.vue
   Module build failed (from ./node_modules/vue-loader/lib/index.js):
   TypeError: Cannot read property 'parseComponent' of undefined
   at parse (/home/vagrant/Code/Taskmanager/node_modules/@vue/component-compiler-utils/dist/parse.js:14:23)
   at Object.module.exports (/home/vagrant/Code/Taskmanager/node_modules/vue-loader/lib/index.js:67:22)
   @ ./resources/assets/js/app.js 12:13-46
   @ multi ./resources/assets/js/app.js ./resources/assets/sass/app.scss

在 package.json 檔案中同一一下版本：

 "dependencies": {
        "vue": "2.5.21",
        "vue-template-compiler": "2.5.21"
    }

再 npm install npm update 就解決了。

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