Run blank app instead of my app

Hello, when i build my app with ionic cordova build android --prod it will normally create an apk. In www folder it will create bunch of js files with names like 2.c53507902fe252ca1911.js and 4 folders - assets, cordova-js-src, plugins and svg. Inside assets folder is my source of app. But when i start the app on phone it will throws blank project with text like create your new app with ionic or something like that and in the left top - BLANK. If i build the app only with cordova or android studio, it normally works. Can you please help me ?