nrf52840 FATFS SDK example disk initialization failed

Hi, 

I am trying to run fatfs_pca10056 example from SDK17.1.0 and I am using SEGGER embedded studio. 

I have formatted SD card to FAT32. But while running I am getting "Disk initialization failed".

The Clock signal is generating well but could not be able to solve that problem even after trying the available solutions in the DevZone.