terminal command not found

Hi. I am trying to create an El Capitan boot usb drive. The InstallMacOSX.pkg file in in my application folder on my iMac24. The usb drive is formatted and called OSX

When I run the line:

sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/OSX --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app --nointeraction

I am getting a response from terminal:

sudo: /Applications/Install OS X El Capitan.app/Contents/Resources/createinstallmedia: command not found

I am not conversant with terminal and am using the above code from the apple support site. Clearly I have something wrong, but can any kind person please advise me what, and I have been looking at this code for an hour now and cannot see what the issue is

Thanks

A