parse error gulp-ng-annotate

[Sunil Lama]

events.js:160
throw er; // Unhandled 'error' event
^
Error: styles\main.css: error: couldn't process source due to parse error
Unexpected character '@' (1:0).

[Kagami]

See https://github.com/Kagami/gulp-ng-annotate#i-got-an-error-error-in-plugin-gulp-ng-annotate-error-couldnt-process-source-due-to-parse-error