This error can occur when the feature class or table is in use by another program, the file is a read-only data source (such as a CAD file), the input has read-only permissions, or the disk is full.
This error can also occur if the field properties specified are not supported by the database.
Verify whether the feature class or table is locked by another user or is read-only. Try closing the application and running the tool again.
Review ArcGIS field data types for more information about fields and field properties.
If the input was created using GeoAnalytics tools and saved to the ArcGIS Data Store of type spatiotemporal, adding fields is not supported.