Question

I am creating an App and when I run it I check the Debug Pane, I am getting these errors Inside the Console:

2009-05-27 07:18:03.852 Spark[1228:10b] [ valueForUndefinedKey:]: the entity Projects is not key value coding-compliant for the key notes.

2009-05-27 07:18:09.029 Spark[1228:10b] Error setting value for key path selectionIndexPaths of object [entity: Projects] (from bound object with object ID 726 in Nib named MainMenu.nib): [ valueForUndefinedKey:]: the entity Projects is not key value coding-compliant for the key notes.

It only happens when I bind a text fields value to the NSTreeController’s selection and Controller Key ‘Notes’, I also notice that when I try and edit the text field in the App the Outline View freezes(this is when the above error shows in console). How can I fix this Have I not binded the Text Field correctly, here is a picture of the Bindings for the text field: http://snapplr.com/840y

Entity Diagram

http://snapplr.com/vqc9

The NEW Error

**2009-05-27 18:37:41.661 Spark[3957:10b] Unacceptable type of value for attribute: property = "notes"; desired type = NSString; given type = NSConcreteAttributedString; value = Alpha Nine Zeta{
    NSColor = NSNamedColorSpace System textColor;
    NSFont = "MarkerFelt-Thin 16.00 pt. P [] (0x001a7190) fobj=0x00146ef0, spc=4.00";
    NSOriginalFont = "MarkerFelt-Thin 16.00 pt. P [] (0x001a7190) fobj=0x00146ef0, spc=4.00";
    NSParagraphStyle = Alignment 3, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (
    28L,
    56L,
    84L,
    112L,
    140L,
    168L,
    196L,
    224L,
    252L,
    280L,
    308L,
    336L
), DefaultTabInterval 0, Blocks (null), Lists (null), BaseWritingDirection -1, HyphenationFactor 0, TighteningFactor 0.05, HeaderLevel 0;
}.**

Answer 1

If a project is selected in your outline view, the text field tries to get the value notes from the ‘selected’ treecontroller item, which is a project. Since a Projects entity has no notes attribute, the KVO throws an exception.

Deselect the binding option ‘Raises for Not Applicable Keys’ in the ‘value’ binding of the text field.