How to fix this error?

[hasnogaems]

F:\>youtube-dl --ffmpeg-location F:\twitch download\ffmpegnew\bin --hls-prefer-n
ative https://www.youtube.com/watch?v=4HNwJR_XfJs
ERROR: 'download\\ffmpegnew\\bin' is not a valid URL. Set --default-search "ytse
arch" (or run  youtube-dl "ytsearch:download\ffmpegnew\bin" ) to search YouTube

[merkle-root]

Put quotes around the ffmpeg path.

Your command line is interpreting F:\twitch and download\ffmpegnew\bin as separate arguments, because of the space.
With command lines, you have to put quotes around paths that contains spaces.

[hasnogaems]

Put quotes around the ffmpeg path.

Your command line is interpreting F:\twitch and download\ffmpegnew\bin as separate arguments, because of the space.
With command lines, you have to put quotes around paths that contains spaces.

I tried ' ' and " " quotes with no sucess.

>youtube-dl --ffmpeg-location "f:\twitch download\ffmpegnew
\bin\" --hls-prefer-native https://www.twitch.tv/videos/398984271
Usage: youtube-dl [OPTIONS] URL [URL...]

youtube-dl: error: You must provide at least one URL.
Type youtube-dl --help to see a list of all options.

[bitraid]

\" escapes the quote. the string should end with bin"