Purple textures on server/People crash on join

[Gad]

Launcher Version: 1.0.1.3

Operating System: 64-bit

Java Version: 64bit Java6

Antivirus Program: When I start up my server and join, I see purple textures on the machines, and people crash when they try to join. Here is a picture. http://imgur.com/otxnV

Using default textures.

Description of Problem:

When I start up my server and join, I see purple textures on the machines, and people crash when they try to join. Here is a picture. http://imgur.com/otxnV

Using default textures.

Error Messages:

Error Log: