My raw files from d750 does not import into LR (have the newest LR CC). Get this error.
Also tried using DNG converter. Did not work
Also checked if NEF codec is updated
Also tried converting the files from Nikons NX2, which resulted in files being downsized from 24 MB to about 1 MB in tif.
Some versions of Nikon software is known to corrupt Raw files so they cannot be read by Adobe software.
Try importing from camera to computer using a card reader or direct via cable from camera to computer.
Alternatively try using this utility
Fix Corrupted Nikon NEF Images
Retrieving data ...