Forge Mod Loader has found ID mismatches - ID from Mod ExtrabiomsXL is missing

[Sannya]

Title: Forge Mod Loader has found ID mismatches - ID from Mod ExtrabiomsXL is missing

Version: 1_0_4

OS: Windows XP, 64 bit I think

Java Version: java 7, update 45

Description of Problem:

My brother have a weak pc, but he tried to launch a Hexxit Server. I tried with the same Data, mine work, his not.

Now my question: Is his pc too weak to launch the server? He has only 2 GB RAM, old processor, graphic board ...

Error Messages:

Forge Mod Loader has found ID mismatches

ID 2200 from Mod ExtrabiomsXL is missing

ID 2201 from Mod ExtrabiomsXL is missing

much more, all from Extrabiomes, IDs:

2200 - 2207, 13127 - 13128, 2216 - 2223

You can not connect to this server.

Error Log:

[Chefsbrian]

Well an ID mismatch isn't usually related to the computer, but I wouldn't recommend trying to play and run an modded server off a machine that is that weak.