Error: Flash Download failed - "Cortex-M3"

Hi,
I can't flash my LPC1768 with uVision 5.21.
I keep getting this messages no matter what I do.

JLink info:
------------
DLL: V6.00e, compiled Aug 4 2016 09:37:38
Firmware: J-Link ARM-OB STM32 compiled Aug 22 2012 19:52:04
Hardware: V7.00
Feature(s) : RDI,FlashDL,FlashBP,JFlash,GDBFull

* JLink Info: TotalIRLen = 4, IRPrint = 0x01
* JLink Info: AP-IDR: 0x24770011, Type: AHB-AP
* JLink Info: Found Cortex-M3 r2p0, Little endian.
* JLink Info: FPUnit: 6 code (BP) slots and 2 literal slots
* JLink Info: CoreSight components:
* JLink Info: ROMTbl 0 @ E00FF000
* JLink Info: ROMTbl 0 [0]: FFF0F000, CID: B105E00D, PID: 002BB000 SCS
* JLink Info: ROMTbl 0 [1]: FFF02000, CID: B105E00D, PID: 002BB002 DWT
* JLink Info: ROMTbl 0 [2]: FFF03000, CID: B105E00D, PID: 002BB003 FPB
* JLink Info: ROMTbl 0 [3]: FFF01000, CID: B105E00D, PID: 002BB001 ITM
* JLink Info: ROMTbl 0 [4]: FFF41000, CID: B105900D, PID: 002BB923 TPIU-Lite
* JLink Info: ROMTbl 0 [5]: FFF42000, CID: B105900D, PID: 002BB924 ETM-M3
ROMTableAddr = 0xE00FF003

Target info:
------------
Device: ARMCM3
VTarget = 3.300V
State of Pins:
TCK: 1, TDI: 0, TDO: 1, TMS: 0, TRES: 1, TRST: 1
Hardware-Breakpoints: 6
Software-Breakpoints: 8192
Watchpoints: 4
JTAG speed: 4000 kHz

Erase Done.
Programming Done.
Contents mismatch at: 0000001CH (Flash=DEH Required=00H) !
Contents mismatch at: 0000001DH (Flash=B5H Required=00H) !
Contents mismatch at: 0000001EH (Flash=FFH Required=00H) !
Contents mismatch at: 0000001FH (Flash=DFH Required=00H) !
Verify Failed!
Error: Flash Download failed - "Cortex-M3"
Flash Load finished at 11:57:41

Any idea why?