Error code 3

Help! Whenever I try to upload any files, I get this message:

Permission denied.
Error code: 3
Error message from server: Permission denied
Request code: 14

What does it mean? Why has this message started to appear? I never had any problems with WinSCP until today!

It means... well... permission denied. The server is saying you don't have permission to upload that file here. You'll need to change your permissions on the server, or upload the file somewhere else.