uni-app 打包编译H5报错

[HBuilder] 12:06:56.698 Module build failed (from ./node_modules/postcss-loader/src/index.js):  
[HBuilder] 12:06:56.702 TypeError: Cannot read property 'length' of undefined  
[HBuilder] 12:06:56.704     at E:\Dcloud淘宝客手机cms\cms\pages\content\content.vue:65:105  
[HBuilder] 12:06:56.704     at module.exports (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-value-parser\lib\unit.js:9:22)  
[HBuilder] 12:06:56.707     at args.forEach (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-minify-gradients\dist\index.js:57:61)  
[HBuilder] 12:06:56.709     at Array.forEach (<anonymous>)  
[HBuilder] 12:06:56.712     at decl.value.walk.node (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-minify-gradients\dist\index.js:52:18)  
[HBuilder] 12:06:56.716     at walk (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-value-parser\lib\walk.js:7:16)  
[HBuilder] 12:06:56.718     at ValueParser.walk (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-value-parser\lib\index.js:18:3)  
[HBuilder] 12:06:56.721     at optimise (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-minify-gradients\dist\index.js:40:64)  
[HBuilder] 12:06:56.724     at D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-loader\node_modules\postcss\lib\container.js:190:18  
[HBuilder] 12:06:56.727     at D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-loader\node_modules\postcss\lib\container.js:135:18  
[HBuilder] 12:06:56.731     at Rule.each (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-loader\node_modules\postcss\lib\container.js:101:16)  
[HBuilder] 12:06:56.731     at Rule.walk (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-loader\node_modules\postcss\lib\container.js:131:17)  
[HBuilder] 12:06:56.734     at D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-loader\node_modules\postcss\lib\container.js:148:24  
[HBuilder] 12:06:56.734     at Root.each (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-loader\node_modules\postcss\lib\container.js:101:16)  
[HBuilder] 12:06:56.737     at Root.walk (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-loader\node_modules\postcss\lib\container.js:131:17)  
[HBuilder] 12:06:56.740     at Root.walkDecls (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-loader\node_modules\postcss\lib\container.js:188:19)  
[HBuilder] 12:06:56.743     at css (D:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-minify-gradients\dist\index.js:139:23)  
[HBuilder] 12:06:56.746     at initializePlugin (D:\HBuilderX\plugins\uniapp-cli\node_modules\cssnano\dist\index.js:31:51)  
[HBuilder] 12:06:56.747     at <anonymous>