Sass Bourbon Neat:CSS在“之后无效”；“最大宽度”：预期的媒体查询列表为“was”；80em 12“；

对于我的Jekyll项目，我有以下Sass代码：

@import "neat/neat-helpers";
$max-width: em(1280);

/* Screen sizes for media query mixin */

$micro-only: new-breakpoint(min-width em(240) max-width em(480) 12);
$medium: new-breakpoint(min-width em(768) 12);
$large: new-breakpoint(min-width em(1280) 12);

然后运行

jekyll build

我得到错误：

Conversion error: Jekyll::Converters::Scss encountered an error converting 'assets/css/main.scss'.
Conversion error: Invalid CSS after "max-width ": expected media query list, was "80em 12"

阅读和，你似乎可以做到：

$micro-only: new-breakpoint(min-width em(240) max-width em(480), 12);

---

assets/css/main.scss

文件是否存在？