You've got a back slash just before "Final In Scope Data.csv".
Assuming that's not the issue:
- Is the file still in the same place?
- Is the file open in another program (such as Excel)?
Also: best practice is to not use files that are on your Desktop. Use a network/cloud location (which won't disappear on you if your computer crashes definitely) or at least a folder similar to "My Tableau Repository", which is in "My Documents". You can always make a backup of "My Documents", but remembering to backup folders and files that are in different places on your computer is asking for one of those to be forgotten.