Another process, with id #######, is currently running ngcc

Issue

I'm trying to build and serve my project. It was working properly, I updated it from git and then suddenly when I serve it, there is an Error saying "Another process, with id 29800, is currently running ngcc." I retried "npm i", also restarted the IDE and even pc, but it still says the same.

Solution

This happens when ngcc (Angular compatibility compiler) is not finished doing what it does, you must have enabled ivy in your Angular project. read here for more info about ivy.

1. First try to run npm install again, to see if it fixes your problem.
2. Try to run ngcc manually.
3. remove this file node_modules/@angular/compiler-cli/ngcc/__ngcc_lock_file__
4. If none of the above worked, then remove node_modules directory and try npm i again.

Answered By - azerafati