Bug Report or Feature Request (mark with an x)

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- [ ] feature request

Command (mark with an x)

- [ ] new
- [ x] build
- [ x] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ x] help
- [ x] version
- [ ] doc

Versions

Angular CLI: 6.1.3
Node: 8.11.3
OS: linux x64
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 0.7.3
@angular/cdk 6.4.3
@angular/cli 6.1.3
@angular/material 6.4.3
@ngtools/webpack 6.0.8
@schematics/angular 0.7.3
@schematics/update 0.7.3
rxjs 6.2.2
typescript 2.7.2
webpack 4.8.3

Repro steps

I'm using angular CLI 6.0.8 from last 3 months, it's working fine up to today, I haven't installed or updated any npm modules, suddenly my code started issue as below, to fix i try updating new version of CLI, then I removed all the node modules and reinstalled, but the issue is not fixed can anyone help me on this, I am not able to identify from the where the issue is from, I believe the issue is from the angular library( dev dependencies),
issue as blow

Invalid JSON character: "<" at 57:52.
Error: Invalid JSON character: "<" at 57:52.
at _readValue (/home/anilkumar/Anil_Kumar_Dyavanapalli/SDN/Buzzybooth/Buzzybooth/frontend/node_modules/@angular/cli/node_modules/@angular-devkit/core/src/json/parser.js:565:19)
at _readArray (/home/anilkumar/Anil_Kumar_Dyavanapalli/SDN/Buzzybooth/Buzzybooth/frontend/node_modules/@angular/cli/node_modules/@angular-devkit/core/src/json/parser.js:321:22)
at _readValue (/home/anilkumar/Anil_Kumar_Dyavanapalli/SDN/Buzzybooth/Buzzybooth/frontend/node_modules/@angular/cli/node_modules/@angular-devkit/core/src/json/parser.js:559:22)
at _readProperty (/home/anilkumar/Anil_Kumar_Dyavanapalli/SDN/Buzzybooth/Buzzybooth/frontend/node_modules/@angular/cli/node_modules/@angular-devkit/core/src/json/parser.js:398:19)
at _readObject (/home/anilkumar/Anil_Kumar_Dyavanapalli/SDN/Buzzybooth/Buzzybooth/frontend/node_modules/@angular/cli/node_modules/@angular-devkit/core/src/json/parser.js:431:30)
at _readValue (/home/anilkumar/Anil_Kumar_Dyavanapalli/SDN/Buzzybooth/Buzzybooth/frontend/node_modules/@angular/cli/node_modules/@angular-devkit/core/src/json/parser.js:562:22)
at _readProperty (/home/anilkumar/Anil_Kumar_Dyavanapalli/SDN/Buzzybooth/Buzzybooth/frontend/node_modules/@angular/cli/node_modules/@angular-devkit/core/src/json/parser.js:398:19)
at _readObject (/home/anilkumar/Anil_Kumar_Dyavanapalli/SDN/Buzzybooth/Buzzybooth/frontend/node_modules/@angular/cli/node_modules/@angular-devkit/core/src/json/parser.js:431:30)
at _readValue (/home/anilkumar/Anil_Kumar_Dyavanapalli/SDN/Buzzybooth/Buzzybooth/frontend/node_modules/@angular/cli/node_modules/@angular-devkit/core/src/json/parser.js:562:22)
at _readProperty (/home/anilkumar/Anil_Kumar_Dyavanapalli/SDN/Buzzybooth/Buzzybooth/frontend/node_modules/@angular/cli/node_modules/@angular-devkit/core/src/json/parser.js:398:19)

The log given by the failure

Desired functionality

Mention any other details that might be useful