Nether kills my server, what do?

[JakeTheChangeling]

My server is currently in a closed beta and we're testing my modpack if there are bugs and we found a really big and weird one: Everytime someone goes into a Netherportal the server crashes and we have no idea why. The weird thing about this is that it only happens on the server, being in the Nether works perfectly fine in singleplayer. I hope someone can help me.

Here are the logfiles the server produced: https://copy.com/P7wRPXWwnf7v

[plowmanplow]

• You have a staggering number of item ID conflicts which need to be resolved before trying to run a server for a modpack.
• It looks like the Bukkit plugin SuperSponge is puking all over the logs. Remove that.

Before any additional troubleshooting can take place the item ID conflicts must be resolved.

[JakeTheChangeling]

These conflits are the reason we got a beta, we wouldn't be able to find it with only two people. And the sponge plugin is now removed, will create a new crashlog tomorrow.

 

EDIT: Alright, it was the plugin, now the nether works just fine. Thank you very much.

Edited July 30, 2014 by JakeTheChangeling

[plowmanplow]

You don't need a "beta" to find the ID conflicts. Just search your ForgeModLoader-client-0.log file for the word "CONFLICT" (without quotes). They are all over the place.