Unknown class '_FITagEditorView' error : is this normal?

Question

I am using the NSPersistentDocument class. When opening a document, I have the following error.

Unknown class '_FITagEditorView', using 'NSView' instead. 
Encountered in Interface Builder file at path /System/Library/Frameworks/AppKit.framework/Resources/French.lproj/NSNavPanelContentView.nib.

Did anyone of you have the same error? Is it normal (it is caused by the new features of Mavericks)? How can I solve it?

Answer 1

FITagEditorView is a private class in Mavericks that is presumably responsible for allowing the user to search for / assign tags on NSOpenPanel and NSSavePanel respectively.

In AppKit, NSSavePanel has a private instance variable of type NSSavePanelAuxiliary, which contains a pointer to an instance of FITagEditorView. NSOpenPanel is a subclass of NSSavePanel is it has this pointer, as well.

FITagEditorView is defined in a private FinderKit.framework, which is in /System/Library/PrivateFrameworks.

I’m not sure why your app isn’t automatically linking it in when needed, although honestly I can’t find what frameworks pull it in—it might be something only pulled in by the PowerBox. Are you running Sandboxed? Is there something odd about your linking step?