Hi @PatriciaCodes,
I spent the last couple of days on this, it looks that cordova-plugin-firebase && cordova-plugin-firebasex cannot live together,
I had to completely remove the all the plugins and then install only firebasex… however I encounter now problems like…
vendor.js:128834 Native: tried calling Firebase.onNotificationOpen, but the Firebase plugin is not installed.
pluginWarn @ vendor.js:128834
vendor.js:128846 Install the Firebase plugin: 'ionic cordova plugin add cordova-plugin-firebase'
I’m still working on it, if anyone else can get into this would be great…
Also have a look at Firebase App unable to Compile on Android with AAPT error