Admob probleme

Hallo Guys

I’m using admit for the first time and I do not know how to implement the code into my game.
The example from solar2D in the documentation wasn’t working.
I hope someone can help me.

My code:

build settings:

plugins =
{
[“plugin.admob”] =
{
publisherId = “com.coronalabs”

    },
}

main lua:

local admob = require( “plugin.admob” )

local appID = “******”

local interstitialUnitID = “********”

– AdMob listener function
local function adListener( event )

if ( event.phase == "init" ) then  -- Successful initialization
    -- Load an AdMob interstitial ad
    admob.load( "interstitial", { adUnitId="**********" } )
end

end

– Initialize the AdMob plugin
admob.init( adListener, { appId="************************" } )

– Sometime later, show the interstitial ad
if ( admob.isLoaded( “interstitial” ) ) then
admob.show( “interstitial” )
end

Thank you for every help!!!