crash at startup with rv4-6 and sponge server

Description

Environment

Sponge server spongeforge-1.10.2-2123-5.1.0-BETA-1879
Crash even when ae2 is the only mod.

crash log:
http://pastebin.com/tK7xtgVr

• Minecraft Version: 1.10.2
• AE2 Version: rv4 alpha 6
• Forge Version: 12.18.2.2123