NPM run serve Error & NPM ERR! code ELIFECYCLE - Solution

cit246@cit246-ThinkPad-T430:~/Desktop/venkat/grafanacoreui$ npm run serve

> @coreui/coreui-free-vue-admin-template@3.0.0 serve /home/cit246/Desktop/venkat/grafanacoreui
> vue-cli-service serve

 INFO  Starting development server...10% building 2/2 modules 0 activeevents.js:298
      throw er; // Unhandled 'error' event
      ^

Error: ENOSPC: System limit for number of file watchers reached, watch '/home/cit246/Desktop/venkat/grafanacoreui/public'
    at FSWatcher.start (internal/fs/watchers.js:169:26)
    at Object.watch (fs.js:1346:11)
    at createFsWatchInstance (/home/cit246/Desktop/venkat/grafanacoreui/node_modules/chokidar/lib/nodefs-handler.js:38:15)
    at setFsWatchListener (/home/cit246/Desktop/venkat/grafanacoreui/node_modules/chokidar/lib/nodefs-handler.js:81:15)
    at FSWatcher.NodeFsHandler._watchWithNodeFs (/home/cit246/Desktop/venkat/grafanacoreui/node_modules/chokidar/lib/nodefs-handler.js:233:14)
    at FSWatcher.NodeFsHandler._handleDir (/home/cit246/Desktop/venkat/grafanacoreui/node_modules/chokidar/lib/nodefs-handler.js:429:19)
    at FSWatcher.<anonymous> (/home/cit246/Desktop/venkat/grafanacoreui/node_modules/chokidar/lib/nodefs-handler.js:477:19)
    at FSWatcher.<anonymous> (/home/cit246/Desktop/venkat/grafanacoreui/node_modules/chokidar/lib/nodefs-handler.js:482:16)
    at FSReqCallback.oncomplete (fs.js:167:5)
Emitted 'error' event on FSWatcher instance at:    at FSWatcher._handleError (/home/cit246/Desktop/venkat/grafanacoreui/node_modules/chokidar/index.js:260:10)
    at createFsWatchInstance (/home/cit246/Desktop/venkat/grafanacoreui/node_modules/chokidar/lib/nodefs-handler.js:40:5)
    at setFsWatchListener (/home/cit246/Desktop/venkat/grafanacoreui/node_modules/chokidar/lib/nodefs-handler.js:81:15)
    [... lines matching original stack trace ...]
    at FSReqCallback.oncomplete (fs.js:167:5) {
  errno: -28,
  syscall: 'watch',
  code: 'ENOSPC',
  path: '/home/cit246/Desktop/venkat/grafanacoreui/public',
  filename: '/home/cit246/Desktop/venkat/grafanacoreui/public'
}
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! @coreui/coreui-free-vue-admin-template@3.0.0 serve: `vue-cli-service serve`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the @coreui/coreui-free-vue-admin-template@3.0.0 serve script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/cit246/.npm/_logs/2020-04-02T13_35_37_958Z-debug.log




Method-1:


When I face this issues on my project,I just cut the package.json file and run npm install

cit246@cit246-ThinkPad-T430:~/Desktop/venkat/grafanacoreui$ npm install
 
npm WARN saveError ENOENT: no such file or directory, open '/home/cit246/Desktop/venkat/grafanacoreui/package.json'
npm WARN enoent ENOENT: no such file or directory, open '/home/cit246/Desktop/venkat/grafanacoreui/package.json'
npm WARN grafanacoreui No description
npm WARN grafanacoreui No repository field.
npm WARN grafanacoreui No README data
npm WARN grafanacoreui No license field.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@2.1.2 (node_modules/babel-jest/node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@2.1.2: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.11 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.11: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

audited 3691114 packages in 37.114s

46 packages are looking for funding
  run `npm fund` for details

found 3585 vulnerabilities (3498 low, 85 moderate, 2 high)
  run `npm audit fix` to fix them, or `npm audit` for details

After completed again past that Package.json as in previous place and Run npm run serve



Method-2:

Running this code in terminal on ubuntu 16.04 and i have solved my problem
echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p



and finally run -:  npm run serve

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