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The following error displays when adding a field to a feature class or table with a field property of Allow NULL Values = NO:
"Failed to add one of the specified fields. The field is not nullable."
The feature class or table contains at least one feature or row. Fields with Allow NULL Values = NO can only be added to empty feature classes or tables.
The only solution for this error in ArcGIS is to recreate the feature class or table so that Allow NULL Values = NO can be specified for fields. The data from the original table needs to be reloaded.