I'm trying to deploy a ReactJS app in my Ubuntu 16.04 server but when I execute the command:

serve -s build

This is my package.json file:

{

  name: client,

  version: 0.1.0,

  private: true,

  dependencies: {

    bootstrap: ^4.3.1,

    history: ^4.9.0,

    jquery: ^3.4.0,

    moment: ^2.24.0,

    popper.js: ^1.15.0,

    react: ^16.8.6,

    react-dom: ^16.8.6,

    react-router-dom: ^5.0.0,

    react-scripts: 2.1.8

  },

  scripts: {

    start: react-scripts start,

    build: react-scripts build,

    test: react-scripts test,

    eject: react-scripts eject

  },

  eslintConfig: {

    extends: react-app

  },

  browserslist: [

    >0.2%,

    not dead,

    not ie <= 11,

    not op_mini all

  ]

}

I get this error:

ERROR: Cannot copy to clipboard: Command failed: xsel --clipboard --input

xsel: Can't open display: (null)

: Inappropriate ioctl for device



   ┌──────────────────────────────────────────────────┐

   │                                                  │

   │   Serving!                                       │

   │                                                  │

   │   - Local:            http://localhost:5000      │

   │   - On Your Network:  http://server_IP:5000   │

   │                                                  │

   └──────────────────────────────────────────────────┘

But the app is not loaded and is not accessible at the port 5000.

How can I figured out this?