Enum describing possible request errors.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/errors/request_error.proto)

| Enums ||
|---|---|
| ## `BAD_RESOURCE_ID` | Resource name provided is malformed. |
| ## `CANNOT_BE_EXECUTED_BY_MANAGER_ACCOUNT` | Request cannot be executed by a manager account. |
| ## `CANNOT_MODIFY_FOREIGN_FIELD` | Mutate request was attempting to modify a readonly field. For instance, Budget fields can be requested for Ad Group, but are read-only for adGroups:mutate. |
| ## `CANNOT_RETURN_SUMMARY_ROW_FOR_REQUEST_WITHOUT_METRICS` | return_summary_row cannot be enabled if request did not select any metrics field. |
| ## `CANNOT_RETURN_SUMMARY_ROW_FOR_VALIDATE_ONLY_REQUESTS` | return_summary_row should not be enabled for validate only requests. |
| ## `CLOUD_PROJECT_NOT_FOUND` | The Google Cloud project in the request was not found. |
| ## `DEVELOPER_TOKEN_PARAMETER_MISSING` | Deprecated: Developer tokens have been sunset. The developer-token parameter is required for all requests. |
| ## `EXPIRED_PAGE_TOKEN` | Next page token specified in user request has expired. |
| ## `IMMUTABLE_FIELD` | The field cannot be modified because it's immutable. It's also possible that the field can be modified using 'create' operation but not 'update'. |
| ## `INCONSISTENT_RETURN_SUMMARY_ROW_VALUE` | return_summary_row parameter value should be the same between requests with page_token field set and their original request. |
| ## `INVALID_CUSTOMER_ID` | Customer ID is invalid. |
| ## `INVALID_ENUM_VALUE` | Enum value is not permitted. |
| ## `INVALID_PAGE_SIZE` | Page size specified in user request is invalid. |
| ## `INVALID_PAGE_TOKEN` | Next page token specified in user request is invalid. |
| ## `LOGIN_CUSTOMER_ID_PARAMETER_MISSING` | The login-customer-id parameter is required for this request. |
| ## `OPERATION_REQUIRED` | Mutate operation should have either create, update, or remove specified. |
| ## `PAGE_SIZE_NOT_SUPPORTED` | Setting the page size is not supported, and will be unavailable in a future version. |
| ## `REQUIRED_FIELD_MISSING` | Required field is missing. |
| ## `RESOURCE_NAME_MALFORMED` | Resource name provided is malformed. |
| ## `RESOURCE_NAME_MISSING` | Resource name is required for this request. |
| ## `RESOURCE_NOT_FOUND` | Requested resource not found. |
| ## `RPC_DEADLINE_TOO_SHORT` | Deadline specified by the client was too short. |
| ## `TOO_MANY_ACTION_OPERATIONS` | Received too many action operations in request. |
| ## `TOO_MANY_MUTATE_OPERATIONS` | Received too many entries in request. |
| ## `TOTAL_RESULTS_COUNT_NOT_ORIGINALLY_REQUESTED` | The total results count cannot be returned if it was not requested in the original request. |
| ## `UNKNOWN` | The received error code is not known in this version. |
| ## `UNSPECIFIED` | Enum unspecified. |
| ## `UNSUPPORTED_VERSION` | This API version has been sunset and is no longer supported. |
| ## `VALIDATE_ONLY_REQUEST_HAS_PAGE_TOKEN` | page_token is set in the validate only request |