I am not able to find the answer..
ERROR in ./node_modules/ngx-toastr/fesm5/ngx-toastr.js
Module not found: Error: Can't resolve '/Users/vasanthan/Mean projects/node_modules/@angular/animations' in '/Users/vasanthan/Mean projects/MEAN-Library/node_modules/ngx-toastr/fesm5'
ERROR in ./node_modules/ngx-toastr/fesm5/ngx-toastr.js
Module not found: Error: Can't resolve '/Users/vasanthan/Mean projects/node_modules/@angular/common' in '/Users/vasanthan/Mean projects/MEAN-Library/node_modules/ngx-toastr/fesm5'
ERROR in ./src/app/app.module.ts
Module not found: Error: Can't resolve '/Users/vasanthan/Mean projects/node_modules/@angular/common/http' in '/Users/vasanthan/Mean projects/MEAN-Library/src/app'
ERROR in ./node_modules/ngx-toastr/fesm5/ngx-toastr.js
Module not found: Error: Can't resolve '/Users/vasanthan/Mean projects/node_modules/@angular/core' in '/Users/vasanthan/Mean projects/MEAN-Library/node_modules/ngx-toastr/fesm5'
ERROR in ./src/main.ts
Module not found: Error: Can't resolve '/Users/vasanthan/Mean projects/node_modules/@angular/core' in '/Users/vasanthan/Mean projects/MEAN-Library/src'
ERROR in ./src/app/app.module.ts
Module not found: Error: Can't resolve '/Users/vasanthan/Mean projects/node_modules/@angular/core' in '/Users/vasanthan/Mean projects/MEAN-Library/src/app'
ERROR in ./src/app/app.component.ts
Module not found: Error: Can't resolve '/Users/vasanthan/Mean projects/node_modules/@angular/core' in '/Users/vasanthan/Mean projects/MEAN-Library/src/app'
ERROR in ./src/app/app.module.ts
Module not found: Error: Can't resolve '/Users/vasanthan/Mean projects/node_modules/@angular/http' in '/Users/vasanthan/Mean projects/MEAN-Library/src/app'
ERROR in ./node_modules/ngx-toastr/fesm5/ngx-toastr.js
Module not found: Error: Can't resolve '/Users/vasanthan/Mean projects/node_modules/@angular/platform-browser' in '/Users/vasanthan/Mean projects/MEAN-Library/node_modules/ngx-toastr/fesm5'
ERROR in ./src/app/app.module.ts
Module not found: Error: Can't resolve '/Users/vasanthan/Mean projects/node_modules/@angular/platform-browser' in '/Users/vasanthan/Mean projects/MEAN-Library/src/app'
ERROR in ./src/main.ts
Module not found: Error: Can't resolve '/Users/vasanthan/Mean projects/node_modules/@angular/platform-browser-dynamic' in '/Users/vasanthan/Mean projects/MEAN-Library/src'
ERROR in ./src/app/app.module.ts
Module not found: Error: Can't resolve '/Users/vasanthan/Mean projects/node_modules/@angular/platform-browser/animations' in '/Users/vasanthan/Mean projects/MEAN-Library/src/app'
ERROR in ./src/app/app.module.ts
Module not found: Error: Can't resolve '/Users/vasanthan/Mean projects/node_modules/@angular/router' in '/Users/vasanthan/Mean projects/MEAN-Library/src/app'
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! library@0.0.0 start: `ng build && node ./bin/www`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the library@0.0.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! /Users/vasanthan/.npm/_logs/2018-09-02T15_52_34_108Z-debug.log
Have you run yarn install in the root of your application? It looks like you don't have any dependencies in the node_modules folder.
Otherwise, you need to provide more information. Are you using the Angular CLI? It seems like your missing all the @angular dependencies.