BatchJobOperation v201607 php library only returns FILE_FORMAT_ERROR

[carl.a...@thenavigators.com.au]

I'm using the googleads-php-lib to build a batch query.

the operations solely consist of AdGroupAdOperation objects. 

I used this example as the basis for my code so the structure is pretty much the same.

https://developers.google.com/adwords/api/docs/samples/php/campaign-management#add-complete-campaigns-using-batch-jobs

I don't understand why I'm getting a file format error when I'm not touching the file.

Any help would be appreciated. Thank you.