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

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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.

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