Server loading with no mods?

[Joshimodo]

Hi folks.

I've set up a private Big Dig server, but despite everything being in the apparently correct folders, no mods load up online, basically launching Vanilla. Some text pops up, initialising some of the mods (that don't actually seem to work anyway), and NEI claims all of the non-Vanilla items have invalid IDs. Everything works fine in singleplayer, but nothing but Vanilla loads on the server.

Could anybody point out why this could be happening, and how to fix it? Thanks in advance.

[Joshimodo]

Update:

[iNFO] Starting minecraft server version 1.5.2

[WARNING] To start the server with more ram, launch it as "java -Xmx1024M -Xms1024M -jar minecraft_server.jar" [iNFO] Loading properties [iNFO] Default game type: SURVIVAL [iNFO] Generating keypair [sEVERE] Encountered an unexpected exception NoClassDefFoundError java.lang.NoClassDefFoundError: org/bouncycastle/crypto/io/CipherInputStream at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:118) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:430) at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573) Caused by: java.lang.ClassNotFoundException: org.bouncycastle.crypto.io.CipherInputStream at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:160) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 3 more

[sEVERE] This crash report has been saved to: