Init failed in SIMPLE TX V1.3

[stephenmasih]

I am able to build the code for dwm1001c but it always shows init failed, I realised it uses
CONFIG_SPI_1=y
CONFIG_SPI_1_NRF_SPIM=y
In the .dts file, it shows SPI1 is connected to

&spi1 {
compatible = "nordic,nrf-spi";
status = "okay";
sck-pin = <4>;
mosi-pin = <6>;
miso-pin = <7>;
cs-gpios = <&gpio0 3 0>;
};

When I checked dwm1001c datasheet I found out the spi configuration is as such
sck-pin = <16>;
mosi-pin = <20>;
miso-pin = <18>;

I tried changing it but it stills shows up INIT FAILED
please help me figure out the issue.