actionscript 3 - Adobe AIR InMobi not showing interstitial /rewarded ads -

i trying use inmobi display interstitial ads on application, don't video. got working pretty banner ads, calls caching interstitial doesn't seem work. seems fine in code though...

inmobi.getinstance.initialize("inmobiid"); inmobi.loadinterstitial("placementid", "fullscreenad"); 

then, later on:

inmobi.showinterstitial("fullscreenad"); 

i got these logs:

in load interstitial in showinterstitial 

did miss out?

thanks!