Property:Author (Exif:Artist)
From korrekt.org
Property "Exif:Artist" as predefined property contains a "Page" type declaration that is incompatible with the default type of this property.
"Author (Exif:Artist)" is a predefined property of type Text. This property is pre-deployed (also known as special property) and comes with additional administrative privileges but can be used just like any other user-defined property.