`ng new` error 'Tree type is not supported

Bug Report or Feature Request (mark with an x)

- [X] bug report -> please search issues before submitting
- [ ] feature request

This may be a duplicate of #11683, but I’m unable to ng new due to some global config problem and the error isn’t helpful in helping me resolve it.

Command (mark with an x)

- [X] new

Versions

Node: 8.10.0
OS: linux x64
Angular: 
... 

Package                      Version
------------------------------------------------------
@angular-devkit/architect    <error>
@angular-devkit/core         <error>
@angular-devkit/schematics   0.7.1
@schematics/angular          <error>
@schematics/update           <error>
rxjs                         <error>

Repro steps

Not sure, happens every time I try to ng new on my machine. I have removed all globally installed yarn packages and deleting my global node_modules folder (verified by failing to run ng at all), then reinstalling them without success.

The log given by the failure

$ ng new my-app Tree type is not supported.

Desired functionality

Scaffold me out an Angular app

[abhijeet029]

Remove node_modules folder and reinstall angular cli again. It will resolve the issue

[schankam]

Since 6.1, it really feels like all the commands are not working correctly… I can’t create a component in a specific module anymore via cli, the ng update does not work with PWA, schematics do not work anymore… Everything is f***ed up, and it’s been 3 weeks. What the hell are they doing ?..