我正在用Compass编译我的SCSS文件和一些库（Twitter Bootstrap和Font Awesome），但是我收到了一个错误：
error path_to_fontawesome_scss/_fontawesome/src/assets/font-awesome/scss/font-awesome-ie7.scss (Line 1: Invalid CSS after "-": expected number or function, was "--")
identical path_to_fontawesome_css/_fontawesome/src/assets/font-awesome/scss/font-awesome-ie7.css
error path_to_fontawesome_scss/_fontawesome/src/assets/font-awesome/scss/font-awesome.scss (Line 1: Invalid CSS after "-": expected number or function, was "--")
identical path_to_fontawesome_css/_fontawesome/src/assets/font-awesome/scss/font-awesome.css
额外信息：我在3.2.1版本中使用FontAwesome库。
您知道我该如何解决这个问题，或者我是否可以忽略来自外部库文件的错误？
提前致谢， 纳塔利娅