升级vue2.0，编译失败，less中报错Module build failed: Unknown word

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ERROR in ./~/css-loader?sourceMap!./~/vux/src/styles/1px.less Module build failed: Unknown word (23:5)

  21 | .vux-1px {
  22 |   &:before {
> 23 |     .setLine();
     |     ^
  24 |   }
  25 | }
  26 |