Xcode 4 error while trying to add a new item to the Preferences Elements array in the parameter set

Question

I created a parameter set for my iOS application and tried to edit the Root.plist file.

I can change some of the existing values ​​(those created by default), but if I try to add a new element (regardless of type), Xcode 4 will exit with the following error:

Does anyone know what might cause this?

I am using Xcode 4.02 build 4A2002a. This is the log:

ASSERTION FAILURE in /SourceCache/DVTKit/DVTKit-221/Framework/Classes/PlistView/DVTPlistDictionaryNode.m:171 Details: method -[DVTPlistDictionaryNode value] is inappropriate for instances of DVTPlistDictionaryNode Object: <DVTPlistDictionaryNode: 0x202442340> Method: -value Thread: <NSThread: 0x200020700>{name = (null), num = 1} Hints: None Backtrace: 0 0x0000000100949773 -[IDEAssertionHandler handleFailureInMethod:object:fileName:lineNumber:messageFormat:arguments:] (in IDEKit) 1 0x000000010006d394 _DVTAssertionFailureHandler (in DVTFoundation) 2 0x00000001002ed3cb -[DVTPlistDictionaryNode value] (in DVTKit) 3 0x00000001002f0443 -[DVTPlistModel replacePlist:withPlist:] (in DVTKit) 4 0x00000001003030d4 -[DVTPlistViewController outlineView:setObjectValue:forTableColumn:byItem:] (in DVTKit) 5 0x00007fff8830e149 -[NSOutlineView _dataSourceSetValue:forColumn:row:] (in AppKit) 6 0x00007fff883c4dd9 -[NSTableView performClickOnCellAtColumn:row:] (in AppKit) 7 0x00007fff883c1200 -[NSTableView _attemptToPerformClickOnFocusedColumn] (in AppKit) 8 0x00007fff86bd511c __NSFireDelayedPerform (in Foundation) 9 0x00007fff867f5be8 __CFRunLoopRun (in CoreFoundation) 10 0x00007fff867f3dbf CFRunLoopRunSpecific (in CoreFoundation) 11 0x00007fff88f577ee RunCurrentEventLoopInMode (in HIToolbox) 12 0x00007fff88f575f3 ReceiveNextEventCommon (in HIToolbox) 13 0x00007fff88f574ac BlockUntilNextEventMatchingListInMode (in HIToolbox) 14 0x00007fff87ec4e64 _DPSNextEvent (in AppKit) 15 0x00007fff87ec47a9 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] (in AppKit) 16 0x00007fff87e8a48b -[NSApplication run] (in AppKit) 17 0x00007fff87e831a8 NSApplicationMain (in AppKit) 18 0x0000000100000eec 19 0x0000000000000002 

This is the root.plist content created by Xcode itself:

 <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>PreferenceSpecifiers</key> <array> <dict> <key>Title</key> <string>Group</string> <key>Type</key> <string>PSGroupSpecifier</string> </dict> <dict> <key>AutocapitalizationType</key> <string>None</string> <key>AutocorrectionType</key> <string>No</string> <key>DefaultValue</key> <string></string> <key>IsSecure</key> <false/> <key>Key</key> <string>name_preference</string> <key>KeyboardType</key> <string>Alphabet</string> <key>Title</key> <string>Name</string> <key>Type</key> <string>PSTextFieldSpecifier</string> </dict> <dict> <key>DefaultValue</key> <true/> <key>Key</key> <string>enabled_preference</string> <key>Title</key> <string>Enabled</string> <key>Type</key> <string>PSToggleSwitchSpecifier</string> </dict> <dict> <key>DefaultValue</key> <real>0.5</real> <key>Key</key> <string>slider_preference</string> <key>MaximumValue</key> <integer>1</integer> <key>MaximumValueImage</key> <string></string> <key>MinimumValue</key> <integer>0</integer> <key>MinimumValueImage</key> <string></string> <key>Type</key> <string>PSSliderSpecifier</string> </dict> </array> <key>StringsTable</key> <string>Root</string> </dict> </plist> 

Answer 1

Sounds like an Apple bug. If you tell Xcode Continue, not Crash, you can continue to work as if nothing had happened. If all else fails, you can use PlistBuddy or the default values ​​to control your plist. (The Editor.app property list would be ideal, but I don't think it is included in the Xcode 4 installation.)