Adcolony interstitial not showing

At the moment I am using adcolony for my rewarded video/interstitials.

my rewarded videos are working perfectly but I’m having touble showing an interstitial ad… should’nt be so complicated and still cannot understand how can I solve this. help would be apreeciated alot. Ill paste the relevant code down here…

main.lua

adcolony = require( "plugin.adcolony" ) local rewardFlag = false -- AdColony listener function local function acListener( event )   if ( event.phase == "init" ) then  -- Successful initialization     print( event.provider )     adcolony.show( "interstitial" );   elseif( event.phase == "displayed" ) then   elseif( event.phase == "closed" ) then     if( event.type == "rewardedVideo" ) then       if( rewardFlag == true ) then         myData.rewardEarned = true;       end     elseif( event.type == "interstitial" ) then       composer.gotoScene( "gameOver", { effect = "fade", time = 50 } );     end   elseif( event.phase == "loaded" ) then   elseif( event.phase == "reward" ) then     print( event.data );     if( rewardFlag == false ) then         rewardFlag = true;     end   end end -- Initialize the AdColony plugin with your Corona Ads API key adcolony.init( acListener, { apiKey="\*\*\*\*" } )

game.lua

        if( myData.timeToShowAd == 2 ) then                                 composer.gotoScene( "interAd",  { effect = "fade", time = 200 } );                             else                                 composer.gotoScene( "gameOver", { effect = "fade", time = 200 } );                             end

interAd.lua

function scene:show( event )     local sceneGroup = self.view     local phase = event.phase     if ( phase == "will" ) then             elseif ( phase == "did" ) then         if( adcolony.isLoaded( "interstitial" ) ) then             myData.timeToShowAd = 0;             adcolony.show( "interstitial" );         else             composer.gotoScene( "gameOver", { effect = "fade", time = 50 } );         end     end end

at that points the game freezes and must force quit the game to play again…

Thank you for you time,

Itay