all XCode project files disappeared

I created an XCode project. While doing a copy/paste to backup, Finder crashed and all the project files were gone in both the project folder and the backup project folder. All that remained was a folder in each titled "build".

The console at the time looks like this:

5/22/10 11:15:20 PM Xcode[26048] [MT] Uncaught Exception:
*** -[NSCFArray insertObject:atIndex:]: attempt to insert nil

Backtrace:
0 0x00007fff83c15d06 __exceptionPreprocess (in CoreFoundation)
1 0x00007fff854d60f3 objc_exception_throw (in libobjc.A.dylib)
2 0x00007fff83c15b47 +[NSException raise:format:arguments:] (in CoreFoundation)
3 0x00007fff83c15ad4 +[NSException raise:format:] (in CoreFoundation)
4 0x00007fff886bdc66 -[NSCFArray insertObject:atIndex:] (in Foundation)
5 0x0000000100007122
6 0x00007fff886c786e _nsnote_callback (in Foundation)
7 0x00007fff83bbdaea __CFXNotificationPost (in CoreFoundation)
8 0x00007fff83baa098 _CFXNotificationPostNotification (in CoreFoundation)
9 0x00007fff886be7d8 -[NSNotificationCenter postNotificationNamebject:userInfo:] (in Foundation)
10 0x00007fff83304d93 _NXShowKeyAndMain (in AppKit)
11 0x00007fff831e0a8c -[NSApplication sendEvent:] (in AppKit)
12 0x00000001008677bd -[PBXExtendedApplication sendEvent:] (in DevToolsInterface)
13 0x00007fff831780aa -[NSApplication run] (in AppKit)
14 0x00007fff83170d7c NSApplicationMain (in AppKit)
15 0x000000010000e97e
16 0x0000000100001844
17 0x0000000000000002
5/22/10 11:15:22 PM com.apple.launchd.peruser.501[151] ([0x0-0x875875].com.apple.Xcode[26048]) Exited with exit code: 1


I don't know where they went, nor does Apple Care, can anyone help?