Xcode crashes on launch - ios

Question

I am developing an Application for iOS and I changed nothing in the Application. But at a restart of my Mac, Xcode crashes every time.
Don't know if this is important, but my spotlight can't find any applications and also when I open the finder and using the shortcut cmd + shift + H I see a white window.
Xcode isn't starting anymore and throws this error:
Process: Xcode [1346]
Path: /Applications/Xcode.app/Contents/MacOS/Xcode
Identifier: com.apple.dt.Xcode
Version: 7.2 (9548)
Build Info: IDEFrameworks-9548000000000000~7
App Item ID: 497799835
App External ID: 814662604
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: Xcode [1346]
Date/Time: 2015-12-24 11:01:44.753 +0100
OS Version: Mac OS X 10.11.2 (15C50)
Report Version: 11
Time Awake Since Boot: 4000 seconds
System Integrity Protection: enabled
Crashed Thread: 4 Dispatch queue: DVTFilePathEventWatcher - event queue
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
VM Regions Near 0:
-->
__TEXT 0000000108a5a000-0000000108a5e000 [ 16K] r-x/rwx SM=COW /Applications/Xcode.app/Contents/MacOS/Xcode
Application Specific Information:
ProductBuildVersion: 7C68
Thread 0:: Dispatch queue: DVTFilePath cache derivation lock for key DVTFilePathKey_SortedDirectoryContents
0 libobjc.A.dylib 0x00007fff8df27aa0 search_method_list(method_list_t const*, objc_selector*) + 2
1 libobjc.A.dylib 0x00007fff8df28d76 lookUpImpOrForward + 413
2 libobjc.A.dylib 0x00007fff8df22591 objc_msgSend + 209
3 com.apple.dt.DVTFoundation 0x0000000108a741f8 -[DVTFileSystemVNode addCachedEntriesFromDictionary:] + 215
4 com.apple.dt.DVTFoundation 0x0000000108bd2e2d __33-[DVTFilePath cachedValueForKey:]_block_invoke549 + 245
5 libdispatch.dylib 0x00007fff9fcbd33f _dispatch_client_callout + 8
6 libdispatch.dylib 0x00007fff9fcbe926 _dispatch_barrier_sync_f_invoke + 74
7 com.apple.dt.DVTFoundation 0x0000000108cd1005 DVTDispatchBarrierSync + 62
8 com.apple.dt.DVTFoundation 0x0000000108a69627 -[DVTDispatchLock performLockedBlock:] + 116
9 com.apple.dt.DVTFoundation 0x0000000108a715b0 -[DVTFilePath cachedValueForKey:] + 1802
10 com.apple.dt.DVTFoundation 0x0000000108a70afc -[DVTToolchainRegistry scanSearchPathAndRegisterToolchains:] + 563
11 com.apple.dt.IDEFoundation 0x00000001097d1a66 IDEInitialize + 655
12 com.apple.dt.IDEKit 0x0000000109ecdf7c -[IDEApplicationController applicationWillFinishLaunching:] + 708
13 com.apple.CoreFoundation 0x00007fffa18fa70c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12
14 com.apple.CoreFoundation 0x00007fffa18fa67f ___CFXRegistrationPost_block_invoke + 63
15 com.apple.CoreFoundation 0x00007fffa18f9d47 _CFXRegistrationPost + 407
16 com.apple.CoreFoundation 0x00007fffa18f9ab2 ___CFXNotificationPost_block_invoke + 50
17 com.apple.CoreFoundation 0x00007fffa18f3d42 -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1922
18 com.apple.CoreFoundation 0x00007fffa17e2145 _CFXNotificationPost + 693
19 com.apple.Foundation 0x00007fff9ef36921 -[NSNotificationCenter postNotificationName:object:userInfo:] + 66
20 com.apple.dt.DVTFoundation 0x0000000108c6cf55 -[NSNotificationCenter(DVTNSNotificationCenterAdditions) _dvt_postNotificationName:object:userInfo:] + 698
21 com.apple.AppKit 0x00007fff9db412c2 -[NSApplication finishLaunching] + 354
22 com.apple.dt.DVTKit 0x0000000109275f62 -[DVTApplication finishLaunching] + 149
23 com.apple.AppKit 0x00007fff9db40e05 -[NSApplication run] + 231
24 com.apple.AppKit 0x00007fff9dac3520 NSApplicationMain + 1176
25 libdyld.dylib 0x00007fff9a8605ad start + 1
Could this be an issue due to Permissions conflicts?
ANSWER:
After I changed the rights from my OSX-Drive to everyone can write&read. Everything worked. But I knew that this is a temporary solution, so I decided to reinstall my MAC and everything was fine.

Answer 1

Delete ~/Library/Developer/Xcode/DerivedData by running this command in terminal:
rm -r ~/Library/Developer/XCode/DerivedData
If that doesnt work, At this point and with given info, all I could recommend to delete and reinstall Xcode.

Answer 2

If the delete of ~/Library/Developer/Xcode/DerivedData is not working for you, try this steps to remove xcuserdata:
open a Finder window and navigate to your project
right-click on the .xcodeproj OR .xcworkspace file
select Show Package Contents
a new window appears
delete a folder called xcuserdata

Answer 3

I had one where i selected a file that was quite large which crashed xcode when it tried to parse it. Then when i restarted it somehow it got set to load that file on start. Only way i saw was to temporarily rename the file that it was trying to load at start so it would load empty.

Answer 4

I'll recommend deleting xcuserdata: folder from both of your .xcodeproj & .xcworkspace file (open with Show Package Contents) and try again.
I hope this will work.

Answer 5

Ensure there are no issues with your SPM packages/dependencies.
This is simply another suggestion. I just spent some time debugging this on a fairly popular open source project.
My Xcode first crashed when I updated a SPM package, so I was fairly certain it was an issue with one of the future commits in that package or a SPM bug. I subscribe to Occam's Razor, so I started going through the changes in the commits.
After some time, I found a duplicate Swift Playground page delcaration in contents.xcplayground. I removed that single line, pushed the PR, and everything worked fine after that.
To be able to reopen the project:
Open project.pbxproj in your code editor of choice (e.g. vi, nano, emacs, atom, code).
Remove the offending package or packages from the /* Begin XCRemoteSwiftPackageReference section */ and /* Begin XCSwiftPackageProductDependency section */ sections.
Save the file and Xcode should now open.
Again, if your Xcode is immediately crashing when opening a project (and you last updated/auto-updated a SPM package) go through your packages.