This simple push to the data layer of a screen view prints an error with verbose logging enabled. This and subsequent calls to the data layer all fail. They are neither logged nor executed.
[[TAGManager instance].dataLayer push:@{@"event" : @"screen-loads",
@"screen-name": [tracker get:kGAIScreenName],
@"viewController" :NSStringFromClass([sender class])
}];
This is the error message being logged:
GoogleTagManager error: _avn has no backing implementation.
The clue was in _avn
. Our friends over at Analytics Pros took a look at the container and noticed that we had a reference to the built in variable {{App Version Name}}
. They noticed that wasn't set, and they think it's a variable that is no longer part of v2.
Anyway, changing {{App Version Name}}
to {{App Version Code}}
got rid of the error and data is flowing freely. Hope this helps.