[FFmpeg-user] File for preset 'libvpx-720p' not found

[aris]

I find it difficult when i use this command "/ffmpeg -i /INPUT.mov -s
1280x720 -vpre libvpx-720p -b 3900k -pass 1 \ -an -f webm -y /OUTPUT.webm",
I found the error message that contains "File for preset 'libvpx-720p' not
found"

please help .
thank you