Log does not come out - xcode

Question

I am trying to make a log appear using this code. However I cannot see the log. xcode just crashes.
-(void) deleteMyFiles:(NSString*)filePath {
NSError *error;
if([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
[[NSFileManager defaultManager] removeItemAtPath:filePath error:&error];
} else {
NSLog(#"not Exists");
}
}
Crash Report of xcode
Process: Xcode [3625]
Path: /Applications/Xcode.app/Contents/MacOS/Xcode
Identifier: com.apple.dt.Xcode
Version: 5.0 (3332.25)
Build Info: IDEApplication-3332025000000000~2
App Item ID: 497799835
App External ID: 38302662
Code Type: X86-64 (Native)
Parent Process: launchd [145]
User ID: 501
Date/Time: 2013-11-17 12:19:38.805 +0900
OS Version: Mac OS X 10.8.5 (12F37)
Report Version: 10
Interval Since Last Report: 58305 sec
Crashes Since Last Report: 6
Per-App Interval Since Last Report: 62699 sec
Per-App Crashes Since Last Report: 6
Anonymous UUID: 2C13D4CB-E939-611C-EA15-933EC101D4E5
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Application Specific Information:
ProductBuildVersion: 5A1413
ASSERTION FAILURE in /SourceCache/IDEKit/IDEKit-3591/Framework/Classes/Editor/IDEEditorDocument.m:702
Details: Autosaving when there is a different document instance registered w/ IDEDocumentController { self:0x7fda77aa62a0: 0 0x00000001099e5f48 -[DVTDocumentLocation(IDESourceControlDocumentLocationAdditions) exportDocumentUsingTemplateDocument:completionBlock:primaryBehavior:] (in IDEKit)
1 0x00000001097ba663 -[IDESourceControlComparisonEditorDataSource documentForPrimaryDocumentLocation:completionBlock:] (in IDEKit)
I think the main reason is that I am using the LLDB debugger but I want to change to GDB but there is no option except LLDB in the edit scheme area.

Answer 1

GDB is not supported in Xcode 5. Quote from release notes:
Important: Xcode 5 does not support use of the LLVM-GCC compiler and the GDB debugger. Existing projects configured to use LLVM-GCC and GDB will be reconfigured to use the LLVM compiler and LLDB debugger when opened by Xcode 5. Please file a bug using bugreporter.apple.com for any issues that prevent you from moving to Xcode 5 for this reason.
Maybe discussion in this thread # discussion.apple.com helps to fix that crashing problem.