IONIC : A utility CLI has unexpectedly closed - ionic-framework

Question

I got this error when i run ionic serve
The Ionic CLI will exit. Please check any output above for error details.
my ionic info
$ionic info
Ionic:
ionic (Ionic CLI) : 4.0.1 (C:\Users\Pc\AppData\Roaming\npm\node_modules\ionic)
Ionic Framework : ionic-angular 3.9.2
#ionic/app-scripts : 3.1.8
Cordova:
cordova (Cordova CLI) : 8.0.0
Cordova Platforms : android 7.0.0
System:
Android SDK Tools : 25.3.1
NodeJS : v6.10.1 (C:\Program Files\nodejs\node.exe)
npm : 5.3.0
OS : Windows 10
Environment:
ANDROID_HOME : C:\Users\Pc\AppData\Local\Android\sdk

Answer 1

Run the below command, being in root directory of Ionic project:
npm install #ionic/app-scripts#latest --save-dev
Then you can try Ionic serve or Ionic s.

Answer 2

I had a similar issue:
Assertion `args[1]->IsString()' failed.
A utility CLI has unexpectedly closed
I fixed that by installing natives lib through npm:
npm i natives

Answer 3

Simpy run
npm install #ionic/app-scripts#latest --save-dev
and then
ionic serve
This error is because of some audit during installing a plugin or adding a plug in

Answer 4

I had a similar issue. I tried several different solutions, and for some reason different ones worked on different machines. Because I'm an illogical masochist, I attempted to fix this issue in the same project on 3 different laptops instead of sending the new fixed version to the other laptops.
The best answer I came up with is to:
Delete node_modules
copy node_modules from a different project (I used an earlier version of my app)
run npm i to install any missing modules
I think this approach should work for almost all instances.

Answer 5

You must kill the NodeJs service I believe it's a bug

Answer 6

Try replacing the package.json scripts parts. Worked for me.
"scripts": {
"build": "ionic build",
"serve": "ionic build",
"start": "npm run serve"
},

Answer 7

Try running:
npm install #ionic/lab

Answer 8

Maybe there is an issue in your hosts file. Make sure your ::1 should enable or not commented.
Example:

Answer 9

I don't know why but using sudo was the only way to solve this on my ubuntu machine!
I just needed to run the command using sudo:
sudo ionic serve

Answer 10

Error: Lock found, but no process with PID 43470 seems to be running.
[ng] (If you are sure no ngcc process is running then you should delete the lock-file at yourproject/node_modules/#angular/compiler-cli/ngcc/ngcc_lock_file.)
rm yourproject/node_modules/#angular/compiler-cli/ngcc/ngcc_lock_file
et voila.

Answer 11

if you get this in the log:
The target entry-point "#ionic-native/media-capture" has missing
dependencies:
#ionic-native/core
try this,
npm install --save #ionic-native/core

Answer 12

My solution:
Upgrade Angular. It'll reveal the real reason for unexpectedly closing in a more verbouse error message. Mine was incompatible dependencies. I simply edited package.json with the right depencies, and ran npm update

Answer 13

For any Linux Users: This error might occur if you installed node.js via the snapstore. Either change PATH to /usr/local/bin/node or use npm to update/install node.js again at the right place.