Running update.sh giving error /nvflash/mkyaffs2image: command not found and /nvflash/mkyaffs2image: command not found

Hi ,
I am new to linux and want to install linux in Colibri T20.
After downloading image Tarball and extracting the image, when in run update.sh with the options as per my board.
I am getting these error messages:
/nvflash/mkyaffs2image: command not found
/nvflash/mkyaffs2image: command not found

Can anyone tell me what is the problem and How to Resolve.

I am getting these error messages:
/nvflash/mkyaffs2image: command not found
./nvflash/nvflash: command not found

thank You.

If you are running the legacy BSP V2.3 on a 64-bit Linux workstation make sure to install the 32-bit compatibility libraries as well as indicated e.g. here:

Should you seek further assistance please indicate what exact hardware (module and carrier board) and software versions of things you are talking about.