Roku Developer Program

[rynop]

I'm trying to add VAST video pre-roll ads to the SThree sample Roku SDK project (the "Simple Grid with Video and Details page (.zip)" version).
I can get it to work on app start by putting the following code into main.brs

library "Roku_Ads.brs"
...
Sub RunUserInterface()
    ...
    raf = Roku_Ads() 
    raf.setAdPrefs(false)       'disable back-filled ads
    raf.setDebugOutput(true)
    raf.setAdUrl("http://pubads.g.doubleclick.net/...") 
    adPods = raf.getAds()
    shouldPlayContent = raf.showAds(adPods)

I however don't want to play an ad on startup, I want to play an ad before a video play. So I figure I can just add the lines above to components/screens/DetailsScreen/DetailsScreen.brs

' on Button press handler
Sub onItemSelected()
    ' first button is Play
    if m.top.itemSelected = 0
        'START ADDING FOR PRE-ROLL
        raf = Roku_Ads() 
        raf.setAdPrefs(false)       'disable back-filled ads
        raf.setDebugOutput(true)
        raf.setAdUrl("http://pubads.g.doubleclick.net/...") 
        adPods = raf.getAds()
        shouldPlayContent = raf.showAds(adPods)
        'END ADDING FOR PRE-ROLL

        if shouldPlayContent
            m.videoPlayer.visible = true
            m.videoPlayer.setFocus(true)
            m.videoPlayer.control = "play"
            m.videoPlayer.observeField("state", "OnVideoPlayerStateChange")
        end if
    end if
End Sub

When I run this I get an error:

Roku_Ads Framework version 1.8
BRIGHTSCRIPT: ERROR: roAppInfo: class PLUGIN|MARKUP on thread RENDER: roku_ads_lib:/Roku_Ads.brs(527)
'Dot' Operator attempted with invalid BrightScript Component or interface reference. (runtime error &hec) in roku_ads_lib:/Roku_Ads.brs(528)
528: ??
Backtrace:
#4  Function roku_ads_util_getappid(key_ As String) As String
   file/line: roku_ads_lib:/Roku_Ads.brs(528)
#3  Function roku_ads_checkallowedfeature(keytype_ As String, util_ As Object) As Boolean
   file/line: roku_ads_lib:/Roku_Ads.brs(1287)
#2  Function roku_ads_constructor() As Object
   file/line: roku_ads_lib:/Roku_Ads.brs(264)
#1  Function roku_ads() As Object
   file/line: roku_ads_lib:/Roku_Ads.brs(32)
#0  Function onitemselected() As Void
   file/line: pkg:/components/screens/DetailsScreen/DetailsScreen.brs(75)

What am I doing wrong here? Can you not play an ad when a method is called from a 

onChange="onItemSelected"

 in the component.xml?

Thanks in advance

[rynop]

I figured it out.  Check out this stack overflow post for complete write-up