使用npm 启动小程序项目时》报错  ERROR  TypeError: Cannot convert undefined or null to object TypeError: Cannot convert undefined or null to object     at Function.assign (<anonymous>)     at /Users/apple/meili/wang.li_dacs_at_bmsoft.com.cn/143/Desktop/北明软件/program/shenzhen-arbitration-uniapp/node_modules/@dcloudio/vue-cli-plugin-uni/lib/chain-webpack.js:53:34     at Object.tap (/Users/apple/meili/wang.li_dacs_at_bmsoft.com.cn/143/Desktop/北明软件/program/shenzhen-arbitration-uniapp/node_modules/webpack-chain/src/Use.js:14:20)     at /Users/apple/meili/wang.li_dacs_at_bmsoft.com.cn/143/Desktop/北明软件/program/shenzhen-arbitration-uniapp/node_modules/@dcloudio/vue-cli-plugin-uni/lib/chain-webpack.js:53:12     at Array.forEach (<anonymous>)     at /Users/apple/meili/wang.li_dacs_at_bmsoft.com.cn/143/Desktop/北明软件/program/shenzhen-arbitration-uniapp/node_modules/@dcloudio/vue-cli-plugin-uni/lib/chain-webpack.js:22:17     at /Users/apple/meili/wang.li_dacs_at_bmsoft.com.cn/143/Desktop/北明软件/program/shenzhen-arbitration-uniapp/node_modules/@vue/cli-service/lib/Service.js:268:40     at Array.forEach (<anonymous>)     at Service.resolveChainableWebpackConfig (/Users/apple/meili/wang.li_dacs_at_bmsoft.com.cn/143/Desktop/北明软件/program/shenzhen-arbitration-uniapp/node_modules/@vue/cli-service/lib/Service.js:268:26)     at PluginAPI.resolveChainableWebpackConfig (/Users/apple/meili/wang.li_dacs_at_bmsoft.com.cn/143/Desktop/北明软件/program/shenzhen-arbitration-uniapp/node_modules/@vue/cli-service/lib/PluginAPI.js:145:25)     at module.exports (/Users/apple/meili/wang.li_dacs_at_bmsoft.com.cn/143/Desktop/北明软件/program/shenzhen-arbitration-uniapp/node_modules/@vue/cli-service/lib/commands/build/resolveAppConfig.js:9:22)     at getWebpackConfig (/Users/apple/meili/wang.li_dacs_at_bmsoft.com.cn/143/Desktop/北明软件/program/shenzhen-arbitration-uniapp/node_modules/@dcloudio/vue-cli-plugin-uni/commands/build.js:89:88)     at getWebpackConfigs (/Users/apple/meili/wang.li_dacs_at_bmsoft.com.cn/143/Desktop/北明软件/program/shenzhen-arbitration-uniapp/node_modules/@dcloudio/vue-cli-plugin-uni/commands/build.js:122:13)     at build (/Users/apple/meili/wang.li_dacs_at_bmsoft.com.cn/143/Desktop/北明软件/program/shenzhen-arbitration-uniapp/node_modules/@dcloudio/vue-cli-plugin-uni/commands/build.js:161:26)     at /Users/apple/meili/wang.li_dacs_at_bmsoft.com.cn/143/Desktop/北明软件/program/shenzhen-arbitration-uniapp/node_modules/@dcloudio/vue-cli-plugin-uni/commands/build.js:80:11     at Service.run (/Users/apple/meili/wang.li_dacs_at_bmsoft.com.cn/143/Desktop/北明软件/program/shenzhen-arbitration-uniapp/node_modules/@vue/cli-service/lib/Service.js:262:12)     at processTicksAndRejections (internal/process/task_queues.js:93:5) [图片] 使用yarn也同样报错 使用cnpm也同样报错