将 Angular 7 更新为 Angular 9 后，无法读取 null 的属性“fileName"中的错误 [英] ERROR in Cannot read property 'fileName' of null After updating Angular 7 to Angular 9

问题描述

在将 angular 7 更新为 9 后，我在无法读取 null 的属性fileName"中出现错误.我已将所有依赖项更新到最新版本.

I'm getting an ERROR in Cannot read property 'fileName' of null after updating angular 7 to 9. I have updated all of my dependencies to the latest version.

package.json

{
    "name": "project name",
    "version": "0.0.0",
    "license": "MIT",
    "scripts": {
        "ng": "ng",
        "start": "ng serve",
        "build": "ng build",
        "test": "ng test",
        "lint": "ng lint",
        "e2e": "ng e2e"
    },
    "private": true,
    "dependencies": {
        "@angular/animations": "9.0.6",
        "@angular/cdk": "^9.1.3",
        "@angular/cli": "9.0.6",
        "@angular/common": "9.0.6",
        "@angular/compiler": "9.0.6",
        "@angular/core": "9.0.6",
        "@angular/forms": "9.0.6",
        "@angular/http": "7.2.16",
        "@angular/platform-browser": "9.0.6",
        "@angular/platform-browser-dynamic": "9.0.6",
        "@angular/router": "9.0.6",
        "@ngui/datetime-picker": "^0.16.2",
        "angular-flash-message": "^3.4.0",
        "angular2-clipboard": "^2.0.14",
        "angular2-color-picker": "^1.3.1",
        "angular2-cookie": "^1.2.6",
        "angular2-flash-messages": "^3.0.1",
        "angular2-modal": "^3.0.3",
        "angular2-multiselect-dropdown": "^4.6.3",
        "chart.js": "^2.9.3",
        "chart.piecelabel.js": "^0.15.0",
        "chartjs-plugin-datalabels": "^0.7.0",
        "chartjs-plugin-labels": "^1.1.0",
        "core-js": "^3.6.4",
        "file-saver": "^2.0.2",
        "file-saver-typescript": "^1.0.1",
        "jasmine-core": "^3.5.0",
        "jasmine-spec-reporter": "^4.2.1",
        "jspdf": "^1.5.3",
        "jspdf-autotable": "^3.2.13",
        "moment-timezone": "^0.5.28",
        "ng-circle-progress": "^1.5.1",
        "ng-click-outside": "^6.0.0",
        "ng-diff-match-patch": "^3.0.1",
        "ng-pick-datetime": "^7.0.0",
        "ng-pick-datetime-moment": "1.0.8",
        "ng2-charts": "^2.3.0",
        "ng2-ckeditor": "^1.2.7",
        "ng2-completer": "^3.0.3",
        "ng2-dnd": "^5.0.2",
        "ng2-pdf-viewer": "^6.1.2",
        "ng5-breadcrumb": "^0.0.6",
        "ngx-bootstrap": "5.5.0",
        "ngx-bootstrap-modal": "^2.0.1",
        "ngx-chips": "^2.1.0",
        "ngx-clipboard": "^13.0.0",
        "ngx-color-picker": "^9.0.0",
        "ngx-pagination": "^5.0.0",
        "ngx-popover": "0.0.16",
        "ngx-progressbar": "^6.0.2",
        "ngx-toastr": "^12.0.0",
        "pluralize": "^8.0.0",
        "rxjs": "^6.5.4",
        "rxjs-compat": "^6.5.4",
        "tslib": "^1.11.1",
        "web-animations-js": "2.3.2",
        "xlsx": "^0.15.6",
        "zone.js": "^0.10.3"
    },
    "devDependencies": {
        "@angular-devkit/build-angular": "^0.900.6",
        "@angular/compiler-cli": "9.0.6",
        "@angular/language-service": "9.0.6",
        "@types/jasmine": "3.5.9",
        "@types/node": "^13.9.1",
        "codelyzer": "~5.2.1",
        "jasmine-spec-reporter": "^4.1.1",
        "karma": "^4.4.1",
        "karma-chrome-launcher": "~3.1.0",
        "karma-cli": "~2.0.0",
        "karma-coverage-istanbul-reporter": "^2.1.1",
        "karma-jasmine": "~3.1.1",
        "karma-jasmine-html-reporter": "^1.5.2",
        "protractor": "^5.4.3",
        "ts-node": "~8.6.2",
        "tslint": "~6.1.0",
        "typescript": "3.8.3"
    } }

当我尝试提供服务、构建应用程序时，它遇到了同样的错误.是否有可能跟踪此错误的位置?它与我目前使用的任何依赖项有关吗?任何人都可以帮我解决这个问题.

When I tried to serve, build the application, it getting the same error. Is there any possibility to track the location of this error?. Is it related to any of the dependencies that I having using currently? Can any please help me to fix this issue.

推荐答案

对我来说迟到了，发帖以防它会帮助别人，但结果我有一个错误的 node_modules 文件夹更远的链(不知道为什么)，这可能给了我两个版本的 @angular/core 混淆了编译器.当我删除其他 node_modules 文件夹时，我不再收到此错误.这是angular 12.1.x.

Late to the game for me, posting in case it will help someone else, but it turned out I had an errant node_modules folder farther up the chain (no idea why), which probably gave me two versions of @angular/core that confused the compiler. When I deleted that other node_modules folder, I no longer received this error. This was with angular 12.1.x.

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