npm run dev后报错

[xianggithubli]

cnpm install后 npm run dev 报错： ERROR in ./src/assets/css/theme-default.scss (./node_modules/[email protected]@css-loader!./node_modules/[email protected]@postcss-loader/lib!./node_modules/[email protected]@sass-loader/lib/loader.js??ref--10-3!./src/assets/css/theme-default.scss) Module build failed (from ./node_modules/[email protected]@sass-loader/lib/loader.js):

undefined ^ Undefined variable: "$--menu-item-color". in I:\Study\PROL\Language\js\netinstance\vue-backend-dev\src\assets\css\common\sidenav.scss (line 55, column 24) @ ./src/assets/css/theme-default.scss 4:14-259 14:3-18:5 15:22-267 @ ./src/main.js @ multi ./build/dev-client ./src/main.js

[xianggithubli]

下载master后没有上面的问题。