Cannot run npm run serve - vue.js

Question

I created a client project for vue and run npm run serve,
but got this error:
Tried to reinstall node,npm, edited some PATHS, but nothing worked
Version
3.2.1
Node and OS info
Node v10.14.0/ npm 6.4.1
0 info it worked if it ends with ok
1 verbose cli [ '/usr/local/bin/node', '/usr/local/bin/npm', 'run', 'serve' ]
2 info using npm#6.4.1
3 info using node#v10.14.0
4 verbose run-script [ 'preserve', 'serve', 'postserve' ]
5 info lifecycle client#0.1.0~preserve: client#0.1.0
6 info lifecycle client#0.1.0~serve: client#0.1.0
7 verbose lifecycle client#0.1.0~serve: unsafe-perm in lifecycle true
8 verbose lifecycle client#0.1.0~serve: PATH: /usr/local/lib/node_modules/npm/node_modules/npm-lifecycle/node-gyp-bin:/Users/alexsexotic/Desktop/work/Test - mongod:node/client/node_modules/.bin:/Library/Frameworks/Python.framework/Versions/3.7/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Library/Frameworks/Python.framework/Versions/3.7/bin:/Users/alexsexotic/.npm-global/bin
9 verbose lifecycle client#0.1.0~serve: CWD: /Users/alexsexotic/Desktop/work/Test - mongod:node/client
10 silly lifecycle client#0.1.0~serve: Args: [ '-c', 'vue-cli-service serve' ]
11 info lifecycle client#0.1.0~serve: Failed to exec serve script
12 verbose stack Error: client#0.1.0 serve: `vue-cli-service serve`
12 verbose stack spawn ENOENT
12 verbose stack at ChildProcess.<anonymous> (/usr/local/lib/node_modules/npm/node_modules/npm-lifecycle/lib/spawn.js:48:18)
12 verbose stack at ChildProcess.emit (events.js:182:13)
12 verbose stack at maybeClose (internal/child_process.js:962:16)
12 verbose stack at Process.ChildProcess._handle.onexit (internal/child_process.js:251:5)
13 verbose pkgid client#0.1.0
14 verbose cwd /Users/alexsexotic/Desktop/work/Test - mongod:node/client
15 verbose Darwin 17.2.0
16 verbose argv "/usr/local/bin/node" "/usr/local/bin/npm" "run" "serve"
17 verbose node v10.14.0
18 verbose npm v6.4.1
19 error file sh
20 error code ELIFECYCLE
21 error errno ENOENT
22 error syscall spawn
23 error client#0.1.0 serve: `vue-cli-service serve`
23 error spawn ENOENT
24 error Failed at the client#0.1.0 serve script.
24 error This is probably not a problem with npm. There is likely additional logging output above.
25 verbose exit [ 1, true ]

Answer 1

You may check your current cli installation and maybe reinstall your vue-cli. Basically, an npx command runs within your project directory. So running npx [whatever] will always use modules installed within your project itself while npm run [whatever] may refer to some globally installed dependencies.
That said, you might also try using yarn. In the past I've also had some trouble running vue-cli through npm so I switched to yarn.
However I can not help you regarding your index.html problem since this may be another issue. But if you've bootstrapped a fresh vue project throughout vue-cli, it should work.

Answer 2

You can try this:
echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p
It's work for me.