NPM install: Unable to resolve dependency tree

[shessafridi]

C:\ngrx-store-effects-app>npm i
npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: ngrx-store-effects-app@0.0.0
npm ERR! Found: @angular/core@5.0.3
npm ERR! node_modules/@angular/core
npm ERR!   @angular/core@"5.0.3" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer @angular/core@"^4.0.0" from @ngrx/effects@4.1.0
npm ERR! node_modules/@ngrx/effects
npm ERR!   @ngrx/effects@"4.1.0" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.