build error

[saadibrahimiv]

ERROR in ./src/styles.scss (./node_modules/@angular-devkit/build-angular/src/angular-cli-files/plugins/raw-css-loader.js!./node_modules/postcss-loader/src??embedded!./node_modules/sass-loader/lib/loader.js??ref--14-3!./src/styles.scss) Module build failed (from ./node_modules/sass-loader/lib/loader.js): Error: ENOENT: no such file or directory, scandir 'C:\Users\Saad\Land-Registration-master\node_modules\node-sass\vendor' at Object.readdirSync (fs.js:790:3) at Object.getInstalledBinaries (C:\Users\Saad\Land-Registration-master\node_modules\node-sass\lib\extensions.js:130:13) at foundBinariesList (C:\Users\Saad\Land-Registration-master\node_modules\node-sass\lib\errors.js:20:15) at foundBinaries (C:\Users\Saad\Land-Registration-master\node_modules\node-sass\lib\errors.js:15:5) at Object.module.exports.missingBinary (C:\Users\Saad\Land-Registration-master\node_modules\node-sass\lib\errors.js:45:5) at module.exports (C:\Users\Saad\Land-Registration-master\node_modules\node-sass\lib\binding.js:15:30) at Object. (C:\Users\Saad\Land-Registration-master\node_modules\node-sass\lib\index.js:14:35) at Module._compile (internal/modules/cjs/loader.js:776:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:787:10) at Module.load (internal/modules/cjs/loader.js:653:32) at tryModuleLoad (internal/modules/cjs/loader.js:593:12) at Function.Module._load (internal/modules/cjs/loader.js:585:3) at Module.require (internal/modules/cjs/loader.js:690:17) at require (internal/modules/cjs/helpers.js:25:18) at Object.sassLoader (C:\Users\Saad\Land-Registration-master\node_modules\sass-loader\lib\loader.js:46:72) ERROR in src/app/web3.service.ts(2,22): error TS2307: Cannot find module 'truffle-contract'.