03_nodejd_npm install error

npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: 5kcrm@11.0.0
npm ERR! Found: vue@2.5.17
npm ERR! node_modules/vue
npm ERR!   vue@"2.5.17" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer vue@"^2.6.0" from @chenfengyuan/vue-qrcode@1.0.2
npm ERR! node_modules/@chenfengyuan/vue-qrcode
npm ERR!   @chenfengyuan/vue-qrcode@"^1.0.2" 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.
npm ERR!
npm ERR!
npm ERR! For a full report see:

4. Reason for error reporting

In new versions of npm, npm install will fail by default when it encounters conflicting peerDependencies.

5.Solution

Use --force or --legacy-peer-deps to resolve this situation.

    --force 会无视冲突，并强制获取远端npm库资源，当有资源冲突时覆盖掉原先的版本。

    --legacy-peer-deps标志是在v7中引入的，目的是绕过peerDependency自动安装；它告诉         NPM 忽略项目中引入的各个modules之间的相同modules但不同版本的问题并继续安装，保            证各个引入的依赖之间对自身所使用的不同版本modules共存。

It is recommended to use –legacy-peer-deps which is safer.

Enter in the terminal

npm install --legacy-peer-deps