AdMob error

When I added the plugin code to build.settings…

[lua]plugins =
{
[“CoronaProvider.ads.admob”] =
{
– required
publisherId = “com.coronalabs”,
},
}, [/lua]

…I started getting this error in the Simulator, Build: 2013.1259:

Runtime error

?:0: attempt to call field ‘request’ (a nil value)

stack traceback:

    [C]: in function ‘request’

    ?: in function ‘downloadManifest’

    ?: in function ‘downloadQueuedManifests’

…should I only be adding plugin code to Build.settings for device builds or is there some way to address this so the code doesn’t make the Simulator choke?