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I have installed angular cli 1.5 from the command below: 

C:\ANGULAR-WORKBENCH>npm install --global @angular/cli@1.5.0

after completion of installation the following lines were displayed on terminal 

+ @angular/cli@1.5.0
added 115 packages and updated 1 package in 105.694s

Then I have tested if it was successfully installed by 

C:\ANGULAR-WORKBENCH>ng -version

or 

C:\ANGULAR-WORKBENCH>ng

In Both cases it displayed the error

module.js:538 throw err; ^
Error: Cannot find module '@angular-devkit/core' at Function.Module._resolveFilename (module.js:536:15) at Function.Module._load (module.js:466:25) at Module.require (module.js:579:17) at require (internal/module.js:11:18) at Object. (C:\Users\User1\AppData\Roaming\npm\node_modules\@angular\cli\node_modules\@angular-devkit\schematics\src\tree\virtual.js:10:16) at Module._compile (module.js:635:30) at Object.Module._extensions..js (module.js:646:10) at Module.load (module.js:554:32) at tryModuleLoad (module.js:497:12) at Function.Module._load (module.js:489:3)

Why this throws the error? How do i fix this issue?

Melchia
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ng mathitis
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    This isn't something SO can help with, it's a [known issue](https://github.com/angular/angular-cli/issues/9307) in a third party library. – jonrsharpe Mar 10 '18 at 13:46
  • Is version 1.5.0 a must for you? Otherwise I would take the @latest. I had the same problem as you with a newer version of the cli and by installing the latest version globally and locally the problem was solved. – zgue Mar 10 '18 at 14:04

3 Answers3

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Perhaps the problem is that you are installing and old angular/cli version, try running this commands in your terminal:

npm uninstall -g angular-cli
npm cache clean or npm cache verify #(if npm > 5)
npm install -g @angular/cli@latest

If you need more datailed explanation please check this link: https://stackoverflow.com/a/43931987/8992452, it worked for me.

NUKE
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All you need to do is run npm i -D @angular-devkit/core in the working directory to fix it.

Vikas
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  • Actually, no. The OP hasn't even build a new project yet. The command above would fail if you just run that without being in a project folder. – R. Richards Mar 10 '18 at 14:12
  • Since the issue was cropped up by running ng serve, I assumed that he is currently in the working directory – Vikas Mar 10 '18 at 14:30
  • The OP doesn't mention `ng serve`. `ng` and `ng -version`, but not serve. – R. Richards Mar 10 '18 at 14:32
  • I have edited my answer, I hope it is correct now @ R. Richards – Vikas Mar 10 '18 at 14:42
  • @Vikas i did run npm i -D @angular-devkit/core but still gives the same issue – ng mathitis Mar 10 '18 at 23:09
  • i'm ok to install cli version 1.6 but would i be able to do angular 5 development with it and if i had installed version 1.5? – ng mathitis Mar 10 '18 at 23:10
  • yes, you can cli version >=1.5 will generate v5 projects by default, but it's better to keep the global and local version of cli in sync see this- https://stackoverflow.com/a/44526528/5695162 – Vikas Mar 11 '18 at 06:21
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You're using an old angular cli version. Try updating it:

$ npm install -g @angular/cli@^1.6.5
Melchia
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