ERROR in ngcc is already running at process with id xxxx [closed]

Solution 1:

Try deleting your ngcc_lock_file in the path:

node_modules/@angular/compiler-cli/ngcc/ngcc_lock_file

Or for Angular 9, the lock file to delete is:

node_modules/@angular/compiler-cli/ngcc/__ngcc_lock_file__

I had the same issue and I and deleted that file and it started working for me.

I hope it helps!

Solution 2:

 rm node_modules/@angular/compiler-cli/ngcc/__ngcc_lock_file__ 

Solution 3:

Working Solution

1. Delete all node modules
2. Close any working terminal or you can shut down your PC if you cant make sure that you've closed all working terminals
3. run npm i to setup your modules
4. run ng s

It's working with me well !