Cannot assign BlackImage using flashsplash command

Hello, I’m trying to do process of flashsplash Blackimage.tss as per this link

But I’m getting error :
“Can’t find root dir entry.
Error opening image file. The file must be in the root folder of the active partition of the SD card.”

I have formatted SD card, changed SD card. But still no luck. I have also changed IMX6 board. But still same error.
However, when i use VF61 with BlackImage.dat image file, everything works fine.