First of, let me say that I am not using the latest Forge build out, but I am using the latest build for the Minecraft version that I am running for my client and server (Minecraft 1.5.2 with Forge 7.8.1.738).
The problem I am having is with the Universal Electricity mods, specifically their IDs. I manually reassigned all IDs in order to make sure there were no conflicts with other mods.
However, from the best of my knowledge, the Server side of Forge is looking for item IDs by adding 256 to the ID number assigned in the config file. I know that there is no difference in the config files because I copied them directly from my config folder directly into the server's.
Attempts to modify the server's config files by adding and subtracting 256 to the item IDs were not successful. Attempts at removing the UE mod specifically stated merely processes the same error with another mod listed as the cause. The item codes are the ingots from Basic Components, though it says the erroneous codes are from Complex Machines (last round of troubleshooting, it said from Assembly Line) Below, I have the error screen I get when trying to log onto the server.
24268 is supposed to be 24012, which is 'ingotTin'
24265 is supposed to be 24009, which is 'ingotBronze'
24266 is supposed to be 24010, which is 'ingotCopper'
24267 is supposed to be 24011, which is 'ingotSteel'
I verified this when I changed their IDs. The error ID would always be 256 more than these. Strangely, the first time I did this, there were more erroneous IDs, and it didn't name which mod there error was supposedly from.
Here is the full Forge Mod Loader client log:
Also, if it helps, here are all the instances 'Severe' pops up in the log, so you don't have to go through all of that to find them.