ios - GoogleTagManager error: _avn has no backing implementation -

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this simple push data layer of screen view prints error verbose logging enabled. , subsequent calls data layer fail. neither logged nor executed.

[[tagmanager instance].datalayer push:@{@"event" : @"screen-loads",                                                     @"screen-name": [tracker get:kgaiscreenname],                                                     @"viewcontroller" :nsstringfromclass([sender class])                                                     }];

this error message being logged:

googletagmanager error: _avn has no backing implementation.

the clue in _avn. our friends on @ analytics pros took @ container , noticed had reference built in variable {{app version name}}. noticed wasn't set, , think it's variable no longer part of v2.

anyway, changing {{app version name}} {{app version code}} got rid of error , data flowing freely. hope helps.


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