I can't run a built Angular project - ERESOLVE unable to resolve dependency tree

Question

I'm following a tutorial of Angular and I wanted to run a project built by the instructor. This is what I do to run it (I found these steps in the 'how-to-use' file)

How to use

Run "npm install" inside this project folder to install all dependencies.

Make sure you use the latest version of the CLI (upgrade guide below)

Run "ng serve" to see the app in action (try "npm start" in case "ng serve" fails).

Feel free to compare it with your project code to spot any errors you might have.

How to upgrade the CLI

Run the below commands - only use "sudo" on Mac/ Linux.

 sudo npm uninstall -g angular-cli @angular/cli npm cache clean --force sudo npm install -g @angular/cli

Upgrading the CLI works just fine, but when I move to the npm install command I get these errors:

npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR! 
npm ERR! While resolving: my-first-app@0.0.0
npm ERR! Found: jasmine-core@3.6.0
npm ERR! node_modules/jasmine-core
npm ERR!   dev jasmine-core@"~3.6.0" from the root project
npm ERR! 
npm ERR! Could not resolve dependency:
npm ERR! peer jasmine-core@">=3.8" from karma-jasmine-html-reporter@1.7.0
npm ERR! node_modules/karma-jasmine-html-reporter
npm ERR!   dev karma-jasmine-html-reporter@"^1.5.4" from the root project
npm ERR! 
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR! 
npm ERR! See /Users/t/.npm/eresolve-report.txt for a full report.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/t/.npm/_logs/2022-09-28T12_08_00_585Z-debug-0.log

Here's my package.json:

{
  "name": "my-first-app",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^11.0.5",
    "@angular/common": "^11.0.5",
    "@angular/compiler": "^11.0.5",
    "@angular/core": "^11.0.5",
    "@angular/forms": "^11.0.5",
    "@angular/platform-browser": "^11.0.5",
    "@angular/platform-browser-dynamic": "^11.0.5",
    "@angular/router": "^11.0.5",
    "bootstrap": "3.3.7",
    "rxjs": "^6.6.3",
    "rxjs-compat": "^6.0.0",
    "tslib": "^2.0.3",
    "zone.js": "^0.10.3"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "^0.1100.4",
    "@angular/cli": "^11.0.4",
    "@angular/compiler-cli": "^11.0.5",
    "@types/jasmine": "~3.6.0",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "^12.19.9",
    "codelyzer": "^6.0.1",
    "jasmine-core": "~3.6.0",
    "jasmine-spec-reporter": "~5.0.0",
    "karma": "~5.1.0",
    "karma-chrome-launcher": "~3.1.0",
    "karma-coverage": "~2.0.3",
    "karma-jasmine": "~4.0.0",
    "karma-jasmine-html-reporter": "^1.5.4",
    "protractor": "~7.0.0",
    "ts-node": "~8.3.0",
    "tslint": "~6.1.0",
    "typescript": "~4.0.2"
  }
}

this is Angular.json

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "my-first-app": {
      "root": "",
      "sourceRoot": "src",
      "projectType": "application",
      "prefix": "app",
      "schematics": {},
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "dist/my-first-app",
            "index": "src/index.html",
            "main": "src/main.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "src/tsconfig.app.json",
            "assets": [
              "src/favicon.ico",
              "src/assets"
            ],
            "styles": [
              "node_modules/bootstrap/dist/css/bootstrap.min.css",
              "src/styles.css"
            ],
            "scripts": []
          },
          "configurations": {
            "production": {
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                }
              ],
              "optimization": true,
              "outputHashing": "all",
              "sourceMap": false,
              "extractCss": true,
              "namedChunks": false,
              "aot": true,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true
            }
          }
        },
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": {
            "browserTarget": "my-first-app:build"
          },
          "configurations": {
            "production": {
              "browserTarget": "my-first-app:build:production"
            }
          }
        },
        "extract-i18n": {
          "builder": "@angular-devkit/build-angular:extract-i18n",
          "options": {
            "browserTarget": "my-first-app:build"
          }
        },
        "test": {
          "builder": "@angular-devkit/build-angular:karma",
          "options": {
            "main": "src/test.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "src/tsconfig.spec.json",
            "karmaConfig": "src/karma.conf.js",
            "styles": [
              "styles.css"
            ],
            "scripts": [],
            "assets": [
              "src/favicon.ico",
              "src/assets"
            ]
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "src/tsconfig.app.json",
              "src/tsconfig.spec.json"
            ],
            "exclude": [
              "**/node_modules/**"
            ]
          }
        }
      }
    },
    "my-first-app-e2e": {
      "root": "e2e/",
      "projectType": "application",
      "architect": {
        "e2e": {
          "builder": "@angular-devkit/build-angular:protractor",
          "options": {
            "protractorConfig": "e2e/protractor.conf.js",
            "devServerTarget": "my-first-app:serve"
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": "e2e/tsconfig.e2e.json",
            "exclude": [
              "**/node_modules/**"
            ]
          }
        }
      }
    }
  },
  "defaultProject": "my-first-app"
}

Answer 1

The problem you are facing is an issue with your dependencies. One of your packages requires a jasmine-core version greater than or equal to 3.8 and your package.json is installing version 3.6 . You just need to update it in package.json Here is a copy of your package.json with this change, note the version in jasmine-core . With this package.json you just need to run npm install and then npm start .

{
  "name": "my-first-app",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^11.0.5",
    "@angular/common": "^11.0.5",
    "@angular/compiler": "^11.0.5",
    "@angular/core": "^11.0.5",
    "@angular/forms": "^11.0.5",
    "@angular/platform-browser": "^11.0.5",
    "@angular/platform-browser-dynamic": "^11.0.5",
    "@angular/router": "^11.0.5",
    "bootstrap": "3.3.7",
    "rxjs": "^6.6.3",
    "rxjs-compat": "^6.0.0",
    "tslib": "^2.0.3",
    "zone.js": "^0.10.3"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "^0.1100.4",
    "@angular/cli": "^11.0.4",
    "@angular/compiler-cli": "^11.0.5",
    "@types/jasmine": "~3.6.0",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "^12.19.9",
    "codelyzer": "^6.0.1",
    "jasmine-core": "~3.8.0",
    "jasmine-spec-reporter": "~5.0.0",
    "karma": "~5.1.0",
    "karma-chrome-launcher": "~3.1.0",
    "karma-coverage": "~2.0.3",
    "karma-jasmine": "~4.0.0",
    "karma-jasmine-html-reporter": "^1.5.4",
    "protractor": "~7.0.0",
    "ts-node": "~8.3.0",
    "tslint": "~6.1.0",
    "typescript": "~4.0.2"
  }
}