＆＃34;模块构建失败：对无效类型的操作＆＃34;使用webpack时

Question

我正在使用webpack来热替换我的代码库，但在运行时遇到下面提到的错误

ERROR in ./~/css-loader!./~/less-loader!./combined.less
        Module build failed: Operation on an invalid type
        @\git\rebellion_tag\rebellion\bower_components\bootstrap\less\responsive-utilities.less (line 77, column 69)
     near lines:
         .visible-sm-block {
          @media (min-width: @screen-sm-min) and (max-width: @screen-sm-max) {
           display: block !important;