ERROR in ./~/css-loader!./~/postcss-loader/lib!./~/less-loader!./src/components/layer/layer.less

Module build failed: visitors[i].run is not a function

?@ D:\imooc\webpack-demo1\src\components\layer\layer.less (line null, column -1)

?near lines:

? ? ? ? width: 600px;

?@ ./src/components/layer/layer.less 4:14-174