Enum describing possible asset set asset errors.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v25/errors/asset_set_asset_error.proto)

| Enums ||
|---|---|
| ## `DUPLICATE_EXTERNAL_KEY` | The asset contains duplicate external key with another asset in the asset set. |
| ## `INVALID_ASSET_SET_TYPE` | The asset set type is not eligible to contain the specified type of assets. |
| ## `INVALID_ASSET_TYPE` | The asset type is not eligible to be linked to the specific type of asset set. |
| ## `PARENT_LINKAGE_DOES_NOT_EXIST` | When attaching a Location typed Asset to a LocationGroup typed AssetSet, the AssetSetAsset linkage between the parent LocationSync AssetSet and the Asset doesn't exist. |
| ## `UNKNOWN` | The received error code is not known in this version. |
| ## `UNSPECIFIED` | Enum unspecified. |