Tried fixing this for a couple hours with no luck.

MacBook-Pro-2:my-cool-ext-web-components-app xxx$ npm start

> @sencha/[email protected] start /Users/xxx/sencha/my-cool-ext-web-components-app
> npm run dev

> @sencha/[email protected] dev /Users/xxx/sencha/my-cool-ext-web-components-app
> webpack-dev-server --env.browser=yes --env.emit=yes --env.verbose=no

ℹ 「ext」: ext-webpack-plugin v7.0.0, Ext JS v6.7.0.210 Commercial Edition, Sencha Cmd v6.7.0.63, webpack v4.32.2, webcomponents
ℹ 「ext」: Starting development build for webcomponents
ℹ 「ext」: Started running ./extract-code.js
ℹ 「wds」: Project is running at
ℹ 「wds」: webpack output is served from /
ℹ 「wds」: Content not from webpack is served from build
ℹ 「wds」: 404s will fallback to /index.html
ℹ 「ext」:Writing code.js to /build/resources
ℹ 「ext」: Finished running ./extract-code.js
ℹ 「ext」: Adding ext/ext.js and ext/ext.css to index.html
ℹ 「ext」: Copying /resources/ to: /build/resources
ℹ 「ext」: Building Ext bundle at: /build/ext
ℹ 「ext」: Processing Build Descriptor : default (development environment)
ℹ 「ext」: Loading compiler context
ℹ 「ext」: Loading app json manifest...
ℹ 「ext」: Processing data with ClosureCompressor
ℹ 「ext」: [ERR] /Users/xxx/sencha/my-cool-ext-web-components-app/node_modules/@sencha/cmd/dist/sencha: line 67: 1960 Abort trap: 6 $java_bin $jvmArgs -jar "$BASEDIR"/sencha.jar "[email protected]"
Error: 134
at ChildProcess.child.on (/Users/xxx/sencha/my-cool-ext-web-components-app/node_modules/@sencha/ext-webpack-plugin/dist/pluginUtil.js:576:41)
at ChildProcess.emit (events.js:182:13)
at maybeClose (internal/child_process.js:962:16)
at (internal/child_process.js:381:11)
at Socket.emit (events.js:182:13)
at Pipe._handle.close (net.js:606:12)