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Cannot read property 'entries' of undefined

See original GitHub issue

[x ] bug report I am submitting this as a bug because there is no clear and definitive answer on how to troubleshoot this issue. It seems to be effecting developers in different ways and / or for different reasons.

Command

- [ x] generate

Versions

npm --version 5.6.0 macOS --version High Sierra Angular CLI: 6.1.4 Node: 8.11.4 OS: darwin x64 Angular: 6.1.3 … animations, common, compiler, compiler-cli, core, forms … http, language-service, platform-browser … platform-browser-dynamic, router, service-worker

Package Version

@angular-devkit/architect 0.6.8 @angular-devkit/build-angular 0.6.8 @angular-devkit/build-optimizer 0.6.8 @angular-devkit/core 0.6.8 @angular-devkit/schematics 0.6.8 @angular/cli 6.1.4 @angular/pwa 0.6.8 @ngtools/webpack 6.0.8 @schematics/angular 0.6.8 @schematics/update 0.7.4 rxjs 6.2.2 typescript 2.9.2 webpack 4.8.3

Repro steps

ng generate command fails for all types component, module, etc, with the following dreaded error:

Cannot read property 'entries' of undefined

with the debug flag, i am seeing this: at new FilteredTree (/Users/mike/myapp/node_modules/@angular-devkit/schematics/src/tree/filtered.js:13:18)

Maybe it is worth digging into @angular-devkit to figure this out myself. 😕

Mention any other details that might be useful

I have already tried removing the node_modules directory and re-installing.

Also tried removing node, npm and angular-cli all together followed by clean installs of each.

In my particular case…

Important to note, that ng serve and ng build are functioning correctly despite the problem with generate.

Also, generating a new project works, as well as using generate within the new project directory OK, so where do i begin to troubleshoot this issue in my existing project?

ANY help greatly appreciated.