Failed to program my target nrf52

Hi! I’ve got this error! Hope someone can help! I’m not able to understand what I’m doing wrong!

openocd -f interface/stlink-v2-1.cfg -f target/nrf52.cfg -c “program blinky_pca10056.hex verify reset exit”

Open On-Chip Debugger 0.10.0 (2017-08-21) [https://github.com/sysprogs/openocd]

Licensed under GNU GPL v2

For bug reports, read

http://openocd.org/doc/doxygen/bugs.html

Info : auto-selecting first available session transport “hla_swd”. To override use ‘transport select ’.

Info : The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD

adapter speed: 10000 kHz

Info : Unable to match requested speed 10000 kHz, using 4000 kHz

Info : Unable to match requested speed 10000 kHz, using 4000 kHz

Info : clock speed 4000 kHz

Info : STLINK v2 JTAG v28 API v2 SWIM v17 VID 0x0483 PID 0x374B

Info : using stlink api v2

Info : Target voltage: 3.264950

Info : nrf52.cpu: hardware has 6 breakpoints, 4 watchpoints

target halted due to debug-request, current mode: Thread

xPSR: 0x01000000 pc: 0x00000214 msp: 0x20002008

** Programming Started **

** Programming Failed **

shutdown command invoked

embedded:startup.tcl:502: Error:

in procedure ‘flash’ called at file “embedded:startup.tcl”, line 502