Problems with Google Play Services
Make sure you have the correct version of Google play services.

Download the latest version of play services info APK from apkmirror. This app will tell you if you already have the right one or which one to download.

After downloading the above apk, open your file manager, (on Samsung devices it's an app called 'my files') go to local storage and open a folder called 'downloads'. There look for the apk that you have just downloaded. Press on it, and it will all of you're sure you want to download from unknown sources. Agree to that, and press 'install'

When it's finished installing, you'll find the app (play services info) among all other apps. Open it, and it will tell you what version of play services you need. The app also let's you download the right version strait from the main page of the app.