Error executing project apk

Hi, can you help me?

Hello, I am new to ionic and am trying to maintain an existing project in the company.

I configured the environment following the recommendations of the project developer with:

Java jdk, sdk manager, NodeJS, Ionic, ngcordova, git and bower

Can I open the project and run it through the ionic serve start --lab

I had to make some modifications on two screens and that was fine.

To build the build I execute the following steps:

Ionic platform add android

Ionic build android

However when I install build.apk on a smartphone, the following error appears:

“Ionic failed to load resource: net :: ERR_FILE_NOT_FOUND file: //android_asset/www.cordova.plugins.js”

And no feature works, other than browsing.