Error while building Gulp in production,?

Question

gulp.js

When building the project, Gulp throws the error "Plumber found unhandled error: SyntaxError in plugin 'gulp-autoprefixer'". What hour I suffer I can not understand what's the matter. I have already checked the entire css code for errors and "missing quotes or colons" everything is clean ... Tell me how to solve this error
I am attaching screenshots from the console
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Answer 1

Maybe it's the BOM symbol at the beginning of the file, maybe problems with the line-ending.
If so, then you can add plugins to the pipe:
1) to normalize line-endings https://www.npmjs.com/package/gulp-eol
2) to throw out the BOM symbol https://www.npmjs.com /package/gulp-bom