Unable to update the headlines of a responsive search ad and vague error reporting

[aromaldev]

Hi,

Thank you for creating a Golang SDK for Google ads API!

We want to implement a feature to update the headlines of a responsive search ad.

`
headlines := requestBody.Headlines

var headlineAssets []*common.AdTextAsset
for _, headline := range headlines {
    newHeadline := headline
    adTextAsset := &common.AdTextAsset{
        Text: &newHeadline,
    }
    headlineAssets = append(headlineAssets, adTextAsset)
}
var descriptionAssets []*common.AdTextAsset
for _, description := range descriptions {
    newDescription := description
    adTextAsset := &common.AdTextAsset{
        Text: &newDescription,
    }
    descriptionAssets = append(descriptionAssets, adTextAsset)
}

// path := "shop"
adGroupAdOperation := &servicespb.AdGroupAdOperation{
    Operation: &servicespb.AdGroupAdOperation_Update{
        Update: &resources.AdGroupAd{
            ResourceName: googleAdsDataModel.ResourceName,
            Ad: &resources.Ad{
                ResourceName: resourceName,
                AdData: &resources.Ad_ResponsiveSearchAd{
                    ResponsiveSearchAd: &common.ResponsiveSearchAdInfo{
                        Headlines: headlineAssets,
                    },
                },
            },
        },
    },
    UpdateMask: &fieldmaskpb.FieldMask{
        Paths: []string{
            "ad.responsive_search_ad.headlines",
        },
    },
}
adGroupAdClient := servicespb.NewAdGroupAdServiceClient(conn)
mutateAdGroupAdRequest := &servicespb.MutateAdGroupAdsRequest{
    CustomerId: googleAdsDataModel.CustomerId,
    Operations: []*servicespb.AdGroupAdOperation{
        adGroupAdOperation,
    },
}
mutateAdGroupAdResponse, err := adGroupAdClient.MutateAdGroupAds(ctx, mutateAdGroupAdRequest)

`

We are getting error response
rpc error: code = InvalidArgument desc = Request contains an invalid argument.
All the functions are returning similar errors. Errors specified in the documentation are not thrown.

Kindly help.

Thanks & Regards,
Aromal S