关于CSS创建的无法识别的输入

Question

我试图在我的Symfony2应用程序中进行资产转储：dump。但是我收到了以下错误。

ParseError: Unrecognised input in /home/vozi/webapp/vendor/duo/cms-bundle/Duo/CMSBundle/Resources/public/vendor/bootstrap/2.0.2/src/less/mixins.less on line 519, column 3:
518
519   .core (@gridColumnWidth, @gridGutterWidth) {
520

ParseError: Unrecognised input in /home/vozi/webapp/vendor/duo/cms-bundle/Duo/CMSBundle/Resources/public/vendor/bootstrap/2.0.2/src/less/mixins.less on line 519, column 3:
518
519   .core (@gridColumnWidth, @gridGutterWidth) {
520

处理以下行时会返回错误。

// The Grid
#grid {

  .core (@gridColumnWidth, @gridGutterWidth) {

    .spanX (@index) when (@index > 0) {
      (~".span@{index}") { .span(@index); }
      .spanX(@index - 1);
    }
    .spanX (0) {}

    .offsetX (@index) when (@index > 0) {
      (~".offset@{index}") { .offset(@index); }
      .offsetX(@index - 1);
    }
    .offsetX (0) {}

    .offset (@columns) {
      margin-left: (@gridColumnWidth * @columns) + (@gridGutterWidth * (@columns - 1)) + (@gridGutterWidth * 2);
    }

    .span (@columns) {
      width: (@gridColumnWidth * @columns) + (@gridGutterWidth * (@columns - 1));
    }

    .row {
      margin-left: @gridGutterWidth * -1;
      .clearfix();
    }

    [class*="span"] {
      float: left;
      margin-left: @gridGutterWidth;
    }

    // Set the container width, and override it for fixed navbars in media queries
    .container,
    .navbar-fixed-top .container,
    .navbar-fixed-bottom .container { .span(@gridColumns); }

    // generate .spanX and .offsetX
    .spanX (@gridColumns);
    .offsetX (@gridColumns);

  }

  .fluid (@fluidGridColumnWidth, @fluidGridGutterWidth) {

    .spanX (@index) when (@index > 0) {
      (~"> .span@{index}") { .span(@index); }
      .spanX(@index - 1);
    }
    .spanX (0) {}

    .span (@columns) {
      width: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1));
    }

    .row-fluid {
      width: 100%;
      .clearfix();
      > [class*="span"] {
        float: left;
        margin-left: @fluidGridGutterWidth;
      }
      > [class*="span"]:first-child {
        margin-left: 0;
      }

      // generate .spanX
      .spanX (@gridColumns);
    }

  }

  .input(@gridColumnWidth, @gridGutterWidth) {

    .spanX (@index) when (@index > 0) {
      (~"input.span@{index}, textarea.span@{index}, .uneditable-input.span@{index}") { .span(@index); }
      .spanX(@index - 1);
    }
    .spanX (0) {}

    .span(@columns) {
      width: ((@gridColumnWidth) * @columns) + (@gridGutterWidth * (@columns - 1)) - 10;
    }

    input,
    textarea,
    .uneditable-input {
      margin-left: 0; // override margin-left from core grid system
    }

    // generate .spanX
    .spanX (@gridColumns);

  }

}

任何人都知道我的问题的根本原因。我是Symfony和Less的新人。