构建代码时出现以下错误，有什么修复吗？
> ng build --prod --no-aot --base-href
92% 块资产优化D:\myproject\node_modules\@angular\cli\node_modules\clean-css\lib\reader\input-source-map-tracker.js:37 if (originalPosition.line === null && line > 1 && 选择器后备 > 0) { ^
TypeError：无法在 originalPositionFor (D:\myproject\node_modules\@angular\cli\node_modules\clean-css\lib\reader\input-source-map-tracker.js:37:24) 处读取未定义的属性“行”原始元数据 (D:\myproject\node_modules\@angular\cli\node_modules\clean-css\lib\tokenizer\tokenize.js:486:43) in intoTokens (D:\myproject\node_modules\@angular\cli\node_modules\clean -css\lib\tokenizer\tokenize.js:240:75) 在标记化 (D:\myproject\node_modules\@angular\cli\node_modules\clean-css\lib\tokenizer\tokenize.js:74:10) 在 fromStyles (D:\myproject\node_modules\@angular\cli\node_modules\clean-css\lib\reader\read-sources.js:147:12) 在 fromString (D:\myproject\node_modules\@angular\cli\node_modules\ clean-css\lib\reader\read-sources.js:48:10) 在 doReadSources (D:\myproject\node_modules\@angular\cli\node_modules\clean-css\lib\reader\read-sources.js:33:12) 在 readSources (D:\myproject\node_modules\@angular\cli\node_modules\clean-css \lib\reader\read-sources.js:24:10) 在 D:\myproject\node_modules\@angular\cli\node_modules\clean-css\lib\clean.js:99:12 在 _combinedTickCallback (internal/process/ next_tick.js:131:7) 在 process._tickCallback (internal/process/next_tick.js:180:9)
这是我的 package.json 片段
"dependencies": {
"@agm/core": "^1.0.0-beta.2",
"@angular/animations": "^5.2.5",
"@angular/common": "^5.2.5",
"@angular/compiler": "^5.2.5",
"@angular/core": "^5.2.5",
"@angular/forms": "^5.2.5",
"@angular/http": "^5.2.5",
"@angular/platform-browser": "^5.2.5",
"@angular/platform-browser-dynamic": "^5.2.5",
"@angular/platform-server": "^5.2.5",
"@angular/router": "^5.2.5",
"@auth0/angular-jwt": "^1.0.0-beta.10",
"@ng-bootstrap/ng-bootstrap": "^1.0.0",
"@swimlane/ngx-charts": "^7.1.0",
"@types/toastr": "^2.1.35",
"angular": "^1.6.9",
"angular-chartist.js": "^4.3.4",
"angular2-chartjs": "^0.3.0",
"angular2-jwt": "^0.2.3",
"angular2-moment": "^1.8.0",
"bootstrap": "4.0.0-beta.2",
"chart.js": "^2.7.0",
"chart.piecelabel.js": "^0.9.0",
"chartist": "^0.11.0",
"chartjs-plugin-piechart-outlabels": "^0.1.4",
"core-js": "^2.4.1",
"d3": "^4.13.0",
"d3-ng2-demo": "^0.2.0",
"font-awesome": "^4.7.0",
"google-libphonenumber": "^2.0.15",
"jquery": "^3.3.1",
"moment-timezone": "^0.5.14",
"ng2-charts": "^1.6.0",
"ngx-intl-tel-input": "^1.0.6",
"popper": "^1.0.1",
"popper.js": "^1.13.0",
"primeng": "^5.2.0",
"roboto-fontface": "^0.8.0",
"rxjs": "^5.5.5",
"tether": "^1.4.3",
"toastr": "^2.1.4",
"zone.js": "^0.8.20"
}
,"devDependencies": {
"@angular/cli": "^1.7.0",
"@angular/compiler-cli": "^5.2.5",
"@angular/language-service": "^4.0.0",
"@types/bootstrap": "^3.3.38",
"@types/jasmine": "~2.5.53",
"@types/jasminewd2": "~2.0.2",
"@types/node": "^6.0.101",
"clean-css": "^4.0.13",
"codelyzer": "~3.0.1",
"jasmine-core": "~2.6.2",
"jasmine-spec-reporter": "~4.1.0",
"karma": "^1.7.1",
"karma-chrome-launcher": "~2.1.1",
"karma-cli": "~1.0.1",
"karma-coverage-istanbul-reporter": "^1.4.1",
"karma-jasmine": "~1.1.0",
"karma-jasmine-html-reporter": "^0.2.2",
"protractor": "~5.1.2",
"ts-node": "~3.0.4",
"tslint": "~5.3.2",
"typescript": "^2.4.2"
}