Can't find stylesheet to import

github上面下载一个前后端分离的项目，运行前端时：
启动服务：npm run dev
报错：
老哥们有没有知道哪里出现的问题，怎么解决呢？

 ERROR  Failed to compile with 1 error                                                                                   13:04:57

 error  in ./src/assets/styles/element-variables.scss     
                                                          
Syntax Error: SassError: Can't find stylesheet to import. 
   ╷                                                      
25 │ @import "~element-ui/packages/theme-chalk/src/index";
   │         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   ╵
  src\assets\styles\element-variables.scss 25:9  root stylesheet


 @ ./src/assets/styles/element-variables.scss 4:14-246 15:3-20:5 16:22-254
 @ ./src/main.js
 @ multi (webpack)-dev-server/client?http://192.168.1.12:80&sockPath=/sockjs-node (webpack)/hot/dev-server.js ./src/main.js      

安装依赖了吗 先安装依赖 npm i