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nRF52840 PDK to external board programming

I'm using the P20 connectors in nRF52 PDK to flash my custom nRF52832 board.

The connections are like this:

SWDIO ----> SWDIO

SWDCLK ---->SWDCLK

VTG ------> VDD

GND DETECT, GND ----> GND

I've powered up the custom board externally. I'll attach a screenshot of the error I'm receiving. Is the connections I've given correct? or Is there any workarounds for solving this problem. nrfjprog is also throwing an error as JLINKARM_DLL_ERROR. 

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