If you’re working on an Angular project and you see the error “Could not find module ‘@angular-devkit/build-angular'” when you try to build or serve your project, it means that the Angular Devkit build package is not properly installed in your project.

To fix this error, you’ll need to install the @angular-devkit/build-angular package by running the following command in your terminal:

npm install --save-dev @angular-devkit/build-angular

This will install the @angular-devkit/build-angular package and save it as a development dependency in your project.

If you are using the Angular CLI to build and serve your project, you may also need to update the Angular CLI to the latest version by running the following command:

npm install -g @angular/cli

Once you’ve installed the necessary packages, try building and serving your project again. This should fix the “Could not find module ‘@angular-devkit/build-angular'” error.

It’s also possible that the error is caused by an outdated version of the @angular-devkit/build-angular package. In this case, you may need to update the package to the latest version by running the following command:

npm update @angular-devkit/build-angular

If you continue to encounter issues, it’s also worth checking for any other missing or outdated dependencies in your project. You can do this by running the npm outdated command, which will list all of the outdated packages in your project. You can then update these packages by running npm update <package-name>.

By following these steps, you should be able to fix the “Could not find module ‘@angular-devkit/build-angular'” error and get your Angular project up and running again.

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