ERROR in ngcc is already running at process with id 5196

angular9
Shyam Narayan picture Shyam Narayan · Mar 6, 2020 · Viewed 18.3k times · Source

When I try to run ng serve command in my project it produce the below error.

ERROR in ngcc is already running at process with id xxxx

Answer

Compiler v2 picture Compiler v2 · Mar 15, 2020

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!

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