I think I missed this part in my androidmanifest.xml file : In line 1 :

What it was before :

<manifest `xmlns:android="http://schemas.android.com/apk/res/android">

what I added : package="com.wizpeertourguidefe"

what it should have been :

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.wizpeertourguidefe">

after this I did gradlew clean and then the build ran with no problems.