ResponsiveSearchAdInfo - Google Ads v16

I have an issue with the Google Ads v16 version. This particular method is causing problems, and I can't update either the descriptions or the headlines. Here is my code, taken from an example of the API for this specific version:

Api reference: https://developers.google.com/google-ads/api/samples/update-responsive-search-ad

If I remove the ResponsiveSearchAdInfo method, for example, to only update the final_urls, this works successfully.

The error it gives me is the following:

error: {     "message": "Request contains an invalid argument.",     "code": 3,     "status": "INVALID_ARGUMENT",     "details": [         {             "@type": "type.googleapis.com\/google.ads.googleads.v16.errors.GoogleAdsFailure",             "errors": [                 {                     "errorCode": {                         "requestError": "UNKNOWN"                     },                     "message": "The error code is not in this version.",                     "location": {                         "fieldPathElements": [                             {                                 "fieldName": "operations",                                 "index": 0                             },                             {                                 "fieldName": "update"                             },                             {                                 "fieldName": "resource_name"                             }                         ]                     }                 }             ],             "requestId": "qub0AMx1K3uIn8f0pUvKlg"         }     ] } 

It seems strange to me that it references resource_name, as without changing anything in that line, I send the parameter to change the URL, and it works fine. By the way, in my controller, I'm not handling this as a static function, like the example shown in the API.

This is mi code:

    $ad = new Ad([         'resource_name' => ResourceNames::forAd($customerId, $adId),         'final_urls' => [$finalUrls],         'final_mobile_urls' => [$finalUrls],           'responsive_search_ad' => new ResponsiveSearchAdInfo([             // Update some properties of the responsive search ad.             'headlines' => [                 new AdTextAsset([                     'text' => 'Cruise to Pluto #' ,                     'pinned_field' => ServedAssetFieldType::HEADLINE_1                 ]),                 new AdTextAsset(['text' => 'Tickets on sale now']),                 new AdTextAsset(['text' => 'Buy your ticket now'])             ],             'descriptions' => [                 new AdTextAsset(['text' => 'Best space cruise ever.']),                 new AdTextAsset([                     'text' => 'The most wonderful space experience you will ever have.'])             ]         ]),            ]); 

Any help is welcome. Thank you!