I added a custom NSBox from the list of UI elements in interface builder to a window in a .xib. If the pop-up menu for custom is selected I can select the margins, frame color and width, etc. But when I run the program XCode reports an error:
2019-10-07 09:55:37.680639-0600 Appname[1291:278976] Failed to set (keyPath) user defined inspected property on (NSBox): [<NSBox 0x1006109a0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key keyPath.
This only happens when the Custom popup menu is selected. Is there some way to supress this error? Is this a problem in XCode 11? Can I fix this?