Editing the filename doesn't do anything, when you are in the wrong folder. In the screenshot of the cmd window, you were in "C:\Users\dani\AppData\Local\Programs\WinSCP".
Also you should connect to the server with ssh and change the directory to /root/ when you try to execute the Server.jar.
remove that --nogui at the end of the java command, waterfall doesn't have a gui.
Also you're in the wrong directory i guess, sorry for spam; check the right filename, the S at the beginning is in lower-case, on the server it's upper-case.
And Waterfall doesn't need 4 gigs of ram, 512 mb should do