AI-generated Key Takeaways
- 
          
The webpage lists various Ad Manager API services with links to their
NotNullError.Reasondocumentation. - 
          
The
NotNullError.Reasonsection specifically details the possible reasons for a null target error within the API. - 
          
These reasons are represented by an enumeration with values like
ARG1_NULL,ARG2_NULL,ARG3_NULL,NULL, andUNKNOWN. 
The reasons for the target error.
- Namespace
 - 
               
https://www.google.com/apis/ads/publisher/v202502 
| 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. |