problems loading bootloader on stand alone zero.

Hi,

I want to burn a bootloader on my stand alone board. But I get the following error:

Open On-Chip Debugger 0.9.0-g932ec70 (2017-02-15-12:33)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
debug_level: 2
Info : only one transport option; autoselect 'swd'
adapter speed: 500 kHz
adapter_nsrst_delay: 100
cortex_m reset_config sysresetreq
Info : CMSIS-DAP: SWD Supported
Info : CMSIS-DAP: Interface Initialised (SWD)
Info : CMSIS-DAP: FW Version = 02.01.0157
Info : SWCLK/TCK = 1 SWDIO/TMS = 1 TDI = 1 TDO = 1 nTRST = 0 nRESET = 1
Info : CMSIS-DAP: Interface ready
Info : clock speed 500 kHz
in procedure 'init'
in procedure 'ocd_bouncer'

Fout bij het branden van de bootloader.

I use the setup in: Zero - #12 by Sulimarco - Arduino Zero - Arduino Forum

I use a small 5 inch ribbon cable from my board to the SWD connector to the Zero PRO.

Can anyone tell me what i'm doing wrong?

Problem solved. did not connect all the grounds en VCC...