avrdude: verification error; content mismatch

Using Arduino IDE 1.x
1

Hello there, I'am getting suddenly this error on uploading my project.
An Hour ago it worked fine, but then this problem appeared!

avrdude: Version 6.0.1, compiled on Apr 15 2015 at 19:59:58
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2009 Joerg Wunsch

System wide configuration file is "C:\Users\mindcode\Desktop\arduino-1.6.5-r2-windows\arduino-1.6.5-r2\hardware\tools\avr/etc/avrdude.conf"

Using Port : COM17
Using Programmer : wiring
Overriding Baud Rate : 115200
AVR Part : ATmega2560
Chip Erase delay : 9000 us
PAGEL : PD7
BS2 : PA0
RESET disposition : dedicated
RETRY pulse : SCK
serial program mode : yes
parallel program mode : yes
Timeout : 200
StabDelay : 100
CmdexeDelay : 25
SyncLoops : 32
ByteDelay : 0
PollIndex : 3
PollValue : 0x53
Memory Detail :

Block Poll Page Polled
Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack

eeprom 65 10 8 0 no 4096 8 0 9000 9000 0x00 0x00
flash 65 10 256 0 yes 262144 256 1024 4500 4500 0x00 0x00
lfuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
hfuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
efuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
lock 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
calibration 0 0 0 0 no 1 0 0 0 0 0x00 0x00
signature 0 0 0 0 no 3 0 0 0 0 0x00 0x00

Programmer Type : Wiring
Description : Wiring
Programmer Model: AVRISP
Hardware Version: 15
Firmware Version Master : 2.10
Vtarget : 0.0 V
SCK period : 43.5 us

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.02s

avrdude: Device signature = 0x1e9801
avrdude: reading input file "C:\Users\mindcode\AppData\Local\Temp\build5084444692791622161.tmp/sketch_jul14a.cpp.hex"
avrdude: writing flash (642 bytes):

Writing | ################################################## | 100% 0.09s

avrdude: 642 bytes of flash written
avrdude: verifying flash memory against C:\Users\mindcode\AppData\Local\Temp\build5084444692791622161.tmp/sketch_jul14a.cpp.hex:
avrdude: load data flash data from input file C:\Users\mindcode\AppData\Local\Temp\build5084444692791622161.tmp/sketch_jul14a.cpp.hex:
avrdude: input file C:\Users\mindcode\AppData\Local\Temp\build5084444692791622161.tmp/sketch_jul14a.cpp.hex contains 642 bytes
avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 0.09s

avrdude: verifying ...
avrdude: verification error, first mismatch at byte 0x0000
0x14 != 0x71
avrdude: verification error; content mismatch

avrdude done. Thank you.