server says "This server requires you to have mcforge installed"

[gregory01]

Title: server says "This server requires you to have mcforge installed"

Version: 3.0.3/3.0.4

OS: Windows 7 Home Premium

Java Version: 7

Description of Problem:

Whenever i try to log on to my server it gives me a message saying," This server requires you to have mcforge installed"

Error Messages:

This server requires you to have mcforge installed

Error Log:

none

[gregory01]

just so you know, i set up the server correctely.

[Jay?]

You've probably got either mismatched versions, or an antivirus preventing you from properly downloading the client.