When I will running with `ng s` or `ng serve`, any port is in use

I haven't project runing, I can put any port, the problem happen.

if I try another project in angular, works

for information the version

```
$ ng -version

Your global Angular CLI version (8.2.0) is greater than your local
version (6.2.9). The local Angular CLI version is used.

To disable this warning use "ng config -g cli.warnings.versionMismatch false".

Angular CLI: 6.2.9
Node: 10.16.3
OS: linux x64
Angular: 6.1.10
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

```