AI-generated Key Takeaways
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NullError indicates an error caused by supplying a null value for an attribute that cannot be null.
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This error is part of the CreativeWrapperService and inherits from ApiError.
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Specific fields like
fieldPath,fieldPathElements,trigger, anderrorStringare inherited from ApiError to provide details about the error. - 
          
The NotNullError has a
reasonfield which is an enum indicating why the null value was not allowed, including reasons likeARG1_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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                            The OGNL field path to identify cause of error.  | 
                  
                        
                           
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                         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)}.  | 
                  
                        
                           
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                            The data that caused the error.  | 
                  
                        
                           
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                            A simple string representation of the error and reason.  | 
                  
                        
                           NotNullError
                        
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                         The error reason represented by an enum. Enumerations 
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