I have an Application build with Ionic 4. When I use to build and install the Application with reload option it works (`ionic cordova run android --l --c` ). But when I do `ionic cordova build android` and deploying in a device, it does not load anything and results in blank screen. On inspecting, the following error got printed.

```
polyfills.js:1 Failed to load resource: net::ERR_FILE_NOT_FOUND
cordova.js:1 Failed to load resource: net::ERR_FILE_NOT_FOUND
vendor.js:1 Failed to load resource: net::ERR_FILE_NOT_FOUND
styles.js:1 Failed to load resource: net::ERR_FILE_NOT_FOUND
main.js:1 Failed to load resource: net::ERR_FILE_NOT_FOUND
runtime.js:1 Failed to load resource: net::ERR_FILE_NOT_FOUND
/assets/icon/favicon.png:1 Failed to load resource: net::ERR_FILE_NOT_FOUND

```

Researched through and added delay in config.xml file `<preference name="loadUrlTimeoutValue" value="700000" />` but that didn't worked. Also removed and add android, still no luck.

If I connect the device to machine and running the application directly to the device with reload command, it is throwing the error **The connection to the server was unsuccessful.** 

Ionic version - 4.10.3; 
Ionic-Android version - android 6.3.0; 
Cordova - 7.1.0