How to add a leadbolt ad?

I tried every tutorial, it doesn’t work for me.
I get this error:
Attempt to invoke virtual method ‘android.net.NetworkInfo android.net.ConnectivityManager.getActiveNetworkInfo()’ on a null object reference
Note: You will not see another error reported for 5 seconds.

Can you show the blocks?

Screenshot_1

@Victor_Palagniuc which other components are you using?

Screenshot_3