AI-generated Key Takeaways
- 
          The page provides a list of services available in the v202508 Ad Manager API. 
- 
          It details the NotNullError.Reasonenumeration, which specifies the possible causes for a null value error within the API.
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          The NotNullError.Reasonenumeration includes values indicating which argument is null (ARG1_NULL, ARG2_NULL, ARG3_NULL), a general NULL value, and an UNKNOWN value for unexposed API versions.
The reasons for the target error.
- Namespace
- 
               https://www.google.com/apis/ads/publisher/v202508
| Enumeration | Description | 
|---|---|
| ARG1_NULL | Assuming that a method will not have more than 3 arguments, if it does, return NULL | 
| ARG2_NULL | |
| ARG3_NULL | |
| NULL | |
| UNKNOWN | The value returned if the actual value is not exposed by the requested API version. |