In my similar case worked:

1. When I put command I got error: ng serve <- command An unhandled exception occurred: Invalid or unexpected token See "C:/(...)/angular-errors.log" for further details. <-output, hold ctrl and click this link (shortcut work on visual studio)
2. under this link on first lines I clicked another link: [error] C:/(...)/node_modules\source-map\lib\source-map-consumer.js:1
3. I opened this file, inside where I found multi of null objects I deleted them and saved this file.
4. again I used ng serve this time it works as expected.

This way worked for me in this case.