xcode quit unexpectedly while using the DVTKit plugin - xcode

Question

I have upgraded the RAM of my mac mini from 4GB to 6 GB, after which my machine is behaving in an unexpected manner,
1) Like Xcode is getting crashed very frequently.
2) System shut down
3) After restarting the machine, now Xcode is not launching and showing following error -
xcode quit unexpectedly while using the DVTKit plugin
the details are -
Process: Xcode [427]
Path: /Applications/Xcode.app/Contents/MacOS/Xcode
Identifier: com.apple.dt.Xcode
Version: 6.0.1 (6528)
Build Info: IDEFrameworks-6528000000000000~2
Code Type: X86-64 (Native)
Parent Process: launchd [158]
Responsible: Xcode [427]
User ID: 501
PlugIn Path: /Applications/Xcode.app/Contents/SharedFrameworks/DVTKit.framework/Versions/A/DVTKit
PlugIn Identifier: com.apple.dt.DVTKit
PlugIn Version: 6.0.1 (6528)
Date/Time: 2014-12-24 17:05:01.324 +0530
OS Version: Mac OS X 10.9.5 (13F34)
Report Version: 11
Anonymous UUID: B8C91A53-C5EC-FA02-FFAF-17A5CF642475
Crashed Thread: 0
Exception Type: EXC_BAD_ACCESS (Code Signature Invalid)
Exception Codes: 0x0000000000000032, 0x000000011059e010
kernel messages:
-0 sec CODE SIGNING: cs_invalid_page(0x11059e000): p=427[Xcode] final status 0x1000200, denying page sending SIGKILL
-0 sec CODE SIGNING: process 427[Xcode]: rejecting invalid page at address 0x11059e000 from offset 0x316000 in file "/Applications/Xcode.app/Contents/SharedFrameworks/DVTKit.framework/Versions/A/DVTKit" (cs_mtime:1410914376.0 == mtime:1410914376.0) (signed:0 validated:0 tainted:1 wpmapped:0 slid:0)
VM Regions Near 0x11059e010:
__TEXT 0000000110288000-0000000110590000 [ 3104K] r-x/rwx SM=COW /Applications/Xcode.app/Contents/SharedFrameworks/DVTKit.framework/Versions/A/DVTKit
--> __DATA 0000000110590000-0000000110653000 [ 780K] rw-/rwx SM=COW /Applications/Xcode.app/Contents/SharedFrameworks/DVTKit.framework/Versions/A/DVTKit
__DATA 0000000110653000-0000000110654000 [ 4K] rw-/rwx SM=NUL /Applications/Xcode.app/Contents/SharedFrameworks/DVTKit.framework/Versions/A/DVTKit
Application Specific Information:
dyld: launch, loading dependent libraries
/Applications/Xcode.app/Contents/MacOS/../SharedFrameworks/DVTKit.framework/Versions/A/DVTKit
Thread 0 Crashed:
0 dyld 0x00007fff67d883d0 ImageLoaderMachOCompressed::rebase(ImageLoader::LinkContext const&) + 1456
1 dyld 0x00007fff67d80200 ImageLoader::recursiveRebase(ImageLoader::LinkContext const&) + 126
2 dyld 0x00007fff67d801dc ImageLoader::recursiveRebase(ImageLoader::LinkContext const&) + 90
3 dyld 0x00007fff67d7fa12 ImageLoader::link(ImageLoader::LinkContext const&, bool, bool, bool, ImageLoader::RPathChain const&) + 142
4 dyld 0x00007fff67d76764 dyld::link(ImageLoader*, bool, bool, ImageLoader::RPathChain const&) + 166
5 dyld 0x00007fff67d773ac dyld::_main(macho_header const*, unsigned long, int, char const**, char const**, char const**, unsigned long*) + 1983
6 dyld 0x00007fff67d7327b dyldbootstrap::start(macho_header const*, int, char const**, long, macho_header const*, unsigned long*) + 477
7 dyld 0x00007fff67d7305e _dyld_start + 54
Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x0000000110288000 rbx: 0x0000000000000020 rcx: 0x0000000000000007 rdx: 0x0000000000000018
rdi: 0x00000001106595a8 rsi: 0x0000000000000018 rbp: 0x00007fff4ff70280 rsp: 0x00007fff4ff701f0
r8: 0x0000000000000001 r9: 0x0000000000000041 r10: 0x000000000000041c r11: 0x00007fff67dc1850
r12: 0x000000011059e010 r13: 0x00000000000002e9 r14: 0x0000000000000c3e r15: 0x0000000110654549
rip: 0x00007fff67d883d0 rfl: 0x0000000000010246 cr2: 0x000000011059e010
Logical CPU: 2
Error Code: 0x00000006
Trap Number: 14
External Modification Summary:
Calls made by other processes targeting this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by all processes on this machine:
task_for_pid: 204
thread_create: 0
thread_set_state: 0
VM Region Summary:
ReadOnly portion of Libraries: Total=258.3M resident=162.9M(63%) swapped_out_or_unallocated=95.4M(37%)
Writable regions: Total=8572K written=44K(1%) resident=220K(3%) swapped_out=0K(0%) unallocated=8352K(97%)
REGION TYPE VIRTUAL
=========== =======
STACK GUARD 56.0M
Stack 8192K
VM_ALLOCATE 8K
__DATA 34.2M
__IMAGE 528K
__LINKEDIT 74.9M
__TEXT 183.4M
__UNICODE 544K
shared memory 4K
=========== =======
TOTAL 357.5M
Model: Macmini6,1, BootROM MM61.0106.B04, 2 processors, Intel Core i5, 2.5 GHz, 6 GB, SMC 2.7f1
Graphics: Intel HD Graphics 4000, Intel HD Graphics 4000, Built-In
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1333 MHz, 0x02FE, 0x45424A3230554638424455302D474E2D4620
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1333 MHz, 0x0000, 0x5630314C3353383447423532383532383133
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x10E), Broadcom BCM43xx 1.0 (5.106.98.100.22)
Bluetooth: Version 4.2.7f3 14616, 3 services, 23 devices, 1 incoming serial ports
Network Service: Ethernet, Ethernet, en0
Serial ATA Device: APPLE HDD HTS545050A7E362, 500.11 GB
USB Device: USB Optical Mouse
USB Device: USB Keyboard
USB Device: Hub
USB Device: Hub
USB Device: IR Receiver
USB Device: BRCM20702 Hub
USB Device: Bluetooth USB Host Controller
USB Device: Hub
USB Device: iPhone
Thunderbolt Bus: Mac mini, Apple Inc., 23.4
Now Xcode is not getting launched?