FTP help

Okay so first of all I’m not sure if this is the right place for this post…but anyway
My garry’s mod server’s FTP have stopped working, when I try to edit a file, I get this error

550 The system cannot find the file specified.

…Please help…

Ask your host.

Home hosted / Paid?
Linux or Windows?

If it is Linux it may be that your files could be capitalized.