SASS error running "ionic serve" android in windows 10

I have an app that builds fine on my mac but trying to build android in windows is throwing this error…

Error: scss\
Error: File to import not found or unreadable: www/lib/bourbon/app/assets/stylesheets/_bourbon
Parent style sheet: stdin
on line 10 of stdin

@import “www/lib/bourbon/app/assets/stylesheets/_bourbon”;

Its probably some silly little error but its got me stumped.

thanks for any help.