App not loads (grey screen) and not showing on chrome://inspect

Hello, I’m developing an app on ionic v3, this is my ionic info:

cli packages: (/usr/lib/node_modules)

    @ionic/cli-utils  : 1.19.2
    ionic (Ionic CLI) : 3.20.0

global packages:

    cordova (Cordova CLI) : 8.0.0 

local packages:

    @ionic/app-scripts : 3.2.0
    Cordova Platforms  : android 6.3.0
    Ionic Framework    : ionic-angular 3.9.2


    Android SDK Tools : 26.1.1
    Node              : v8.11.4
    npm               : 5.6.0 
    OS                : Linux 4.15

Environment Variables:

    ANDROID_HOME : /home/user/Android/Sdk


    backend : pro

But when I run ionic cordova run android -l, there are no errors on console, but the app is not working, there is only a gray screen and in chrome://inspect there is my mobile phone target but not the app bellow. What is the problem???

Thanks for help!!