As follows, I use the following code to update:
```python
ad_group_ad_operation = client.get_type("AdGroupAdOperation")
ad_group_ad = ad_group_ad_operation.update
ad_group_ad.resource_name = ad_group_ad_resource_name
ad_headlines = []
for headline in headlines:
headline_text = headline['text']
if headline['pinned_field'] == 'UNSPECIFIED':
headline_pinned_field = None
else:
headline_pinned_field =
client.enums.ServedAssetFieldTypeEnum[headline['pinned_field']]
ad_headlines.append(create_ad_text_asset(client, headline_text,
headline_pinned_field))
ad_group_ad.ad.responsive_search_ad.headlines.extend(ad_headlines)
client.copy_from(
ad_group_ad_operation.update_mask,
protobuf_helpers.field_mask(None, ad_group_ad._pb),
)
```
But I got the following response:
```
status {
code: 3
message: "Field \'ad.responsive_search_ad.headlines\' cannot be modified by
\'UPDATE\' operation., at
mutate_operations[61].ad_group_ad_operation.update.ad.responsive_search_ad.headlines"
details {
type_url:
"type.googleapis.com/google.ads.googleads.v18.errors.GoogleAdsFailure"
value: "\n\300\001\n\002\010\013\022SField
'ad.responsive_search_ad.headlines' cannot be modified by 'UPDATE'
operation."e\022\025\n\021mutate_operations\030=\022\027\n\025ad_group_ad_operation\022\010\n\006update\022\004\n\002ad\022\026\n\024responsive_search_ad\022\013\n\theadlines"
}
}
```
How do I update the headlines?
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