ng-add schematics broken in 6.2 (e.g. @angular/material)

[alexeagle]

$ ng -v

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 6.2.1
Node: 8.9.1
OS: linux x64
Angular: 
... 

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.8.1
@angular-devkit/core         0.8.1
@angular-devkit/schematics   0.8.1
@schematics/angular          0.8.1
@schematics/update           0.8.1
rxjs                         6.2.2
typescript                   2.9.2

$ ng new repro-add
$ cd repro-add
$ grep architect angular.json
$ grep targets angular.json
      "targets": {
      "targets": {
$ ng add @angular/material
Installing packages for tooling via npm.
npm WARN @angular/material@6.4.7 requires a peer of @angular/cdk@6.4.7 but none is installed. You must install peer dependencies yourself.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.4 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.4: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

+ @angular/material@6.4.7
added 69 packages in 6.463s
Installed packages for tooling via npm.
Your project is not using the default configuration for build and test. The Angular Material schematics can only be used with the default configuration

[alexeagle]

/cc @jelbourn

[ankitpatra1997]

Can anyone please help me out with this :
ankit@ankit-Lenovo-ideapad-510-15IKB:~/materialdemo/AngularApp$ ng add @angular/material
Installing packages for tooling via npm.
WARNING: This command may not execute successfully. The package/collection may not support the 'targets' field within '/home/ankit/materialdemo/AngularApp/angular.json'. This can be corrected by renaming the following 'targets' fields to 'architect':

1. Line: 12; Column: 7
2. Line: 101; Column: 7

Your project is not using the default configuration for build and test. The Angular Material schematics can only be used with the default configuration