AI-generated Key Takeaways
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NotNullErroris an API error that occurs when a null value is provided for an attribute that is required to be non-null. - 
          
This error is inherited from
ApiErrorand includes fields likefieldPath,fieldPathElements,trigger, anderrorStringfor identifying the cause. - 
          
The
NotNullErrorspecifically has areasonfield, an enum indicating why the null value caused the error, such asARG1_NULL,ARG2_NULL,ARG3_NULL,NULL, orUNKNOWN. 
Caused by supplying a null value for an attribute that cannot be null.
- Namespace
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https://www.google.com/apis/ads/publisher/v202508 
                        Field | 
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|---|---|
                        
                           ApiError (inherited)
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                  |
                        
                           
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                            The OGNL field path to identify cause of error.  | 
                  
                        
                           
                      | 
                     
                        
                         A parsed copy of the field path. For example, the field path "operations[1].operand" corresponds to this list: {FieldPathElement(field = "operations", index = 1), FieldPathElement(field = "operand", index = null)}.  | 
                  
                        
                           
                      | 
                     
                         
                            The data that caused the error.  | 
                  
                        
                           
                      | 
                     
                         
                            A simple string representation of the error and reason.  | 
                  
                        
                           NotNullError
                        
                      | 
                  |
                        
                           
                      | 
                     
                        
                         The error reason represented by an enum. Enumerations 
  |