There is currently an issue with your rendering for the Alloy Smelters...

Details:
When in a loaded chunk the SpecialRenderer used causes the server to crash.

• Forge version: 9.10.1.871
• MC version: 1.6.2
• Stacktrace: http://pastebin.com/VSJD63w2

Any more info needed, let me know.

so compile fixed code please, is that so hard?

already fixed.