Error: Could not find the '@angular-devkit/build-angular:ng-packagr' builder's node package.

[maximilianmau]

When I try to run "npm run build" the following output comes:

Node packages may not be installed. Try installing with 'npm install'.
Error: Could not find the '@angular-devkit/build-angular:ng-packagr' builder's node package.

This is my ng version

Angular CLI: 17.3.0
Node: 20.12.2
Package Manager: npm 10.5.0
OS: win32 x64

Angular: <error>
... animations, common, core, forms, platform-browser
... platform-browser-dynamic, router

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1703.0 (cli-only)
@angular-devkit/build-angular   19.0.7 (cli-only)
@angular-devkit/core            17.3.0 (cli-only)
@angular-devkit/schematics      17.3.0 (cli-only)
@angular/cli                    17.3.0 (cli-only)
@angular/compiler               19.0.6 (cli-only)
@angular/compiler-cli           19.0.6 (cli-only)
@schematics/angular             17.3.0 (cli-only)
ng-packagr                      19.0.1 (cli-only)
rxjs                            7.8.1 (cli-only)
typescript                      5.6.3 (cli-only)
zone.js                         <error>

Desktop (please complete the following information):

• OS: Windows

I had to install build-angular and ng-packagr myself because otherwise these packages were displayed with . But despite the manual installation it doesn't work.