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

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.

The Laptop Crashed and I got this problem after restart. Removing the below file from ionic project solved the problem.

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

Try deleting your ngcc_lock_file in the path:

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

It's work for me.

Fix this all in one easy command:

run npm ci

this will delete node_modules and npm install

just remove the node_modulesthen run npm i

I deleted the file node_modules/@angular/compiler-cli/ngcc/ngcc_lock_file_ from the node_modules folder and its working fine.

I deleted the file node_modules/@angular/compiler-cli/ngcc/ngcc_lock_file_ from the node_modules folder and its working fine. angular v10

deleting lock file in nodes module at the following location will fix this errors

*C:\Users\OneDrive\Desktop\app\node_modules\@angular\compiler-cli\ngcc\src\locking*

delete the lock-file javascript file over there.

if it still shows the same error then delete the entire lock-files folder ,restart command prompt and then it will run

Also if above solutions, dosen´t work it could be that the pipeline has too little space to work with side processes. What you could do is go to angular.json and search for this object:

"budgets": [{"type": "initial","maximumWarning": "4mb","maximumError": "5mb"}]

and raise the limits on maximumError for example.

More about budgets here: angular.io/guide

Had the same issue running angular with a docker file, and like suggested here I deleted ngcc_lock_file BEFORE running npm install

simply run rm -rf node_modules && npm install

Just run

ionic repair

And select Yes