When I try to run my mod in Eclipse, it doesn't load. This is the report I get:

 

[19:02:03] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[19:02:03] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[19:02:03] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
[19:02:03] [main/INFO] [FML]: Forge Mod Loader version 7.2.156.1061 for Minecraft 1.7.2 loading
[19:02:03] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.7.0_51, running on Windows 8:amd64:6.2, installed at C:\Program Files\Java\jre7
[19:02:03] [main/INFO] [FML]: Managed to load a deobfuscated Minecraft name- we are in a deobfuscated environment. Skipping runtime deobfuscation
[19:02:03] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[19:02:03] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[19:02:03] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[19:02:03] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[19:02:03] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper
[19:02:03] [main/ERROR] [FML]: The binary patch set is missing. Either you are in a development environment, or things are not going to work!
[19:02:03] [main/ERROR] [FML]: The minecraft jar file:/C:/Users/Jake/.gradle/caches/minecraft/net/minecraftforge/forge/1.7.2-10.12.1.1061/forgeSrc-1.7.2-10.12.1.1061.jar!/net/minecraft/client/ClientBrandRetriever.class appears to be corrupt! There has been CRITICAL TAMPERING WITH MINECRAFT, it is highly unlikely minecraft will work! STOP NOW, get a clean copy and try again!
[19:02:03] [main/ERROR] [FML]: FML has been ordered to ignore the invalid or missing minecraft certificate. This is very likely to cause a problem!
[19:02:03] [main/ERROR] [FML]: Technical information: ClientBrandRetriever was at jar:file:/C:/Users/Jake/.gradle/caches/minecraft/net/minecraftforge/forge/1.7.2-10.12.1.1061/forgeSrc-1.7.2-10.12.1.1061.jar!/net/minecraft/client/ClientBrandRetriever.class, there were 0 certificates for it
[19:02:03] [main/ERROR] [FML]: FML appears to be missing any signature data. This is not a good thing
[19:02:03] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper
[19:02:03] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLDeobfTweaker
[19:02:04] [main/INFO] [LaunchWrapper]: Launching wrapped minecraft {net.minecraft.client.main.Main}
[19:02:04] [main/INFO]: Setting user: Player406
[19:02:05] [Client thread/INFO]: LWJGL Version: 2.9.0
[19:02:05] [Client thread/INFO] [MinecraftForge]: Attempting early MinecraftForge initialization
[19:02:05] [Client thread/INFO] [FML]: MinecraftForge v10.12.1.1061 Initialized
[19:02:05] [Client thread/INFO] [FML]: Replaced 141 ore recipies
[19:02:05] [Client thread/INFO] [MinecraftForge]: Completed early MinecraftForge initialization
[19:02:06] [Client thread/INFO] [FML]: Searching C:\Users\Jake\Desktop\MCP\LOTR\[1.7.2] LOTR Public Beta 17\eclipse\mods for mods
[19:02:06] [Client thread/ERROR] [FML]: FML has detected a mod that is using a package name based on 'net.minecraft.src' : net.minecraft.src.FMLRenderAccessLibrary. This is generally a severe programming error.  There should be no mod code in the minecraft namespace. MOVE YOUR MOD! If you're in eclipse, select your source code and 'refactor' it into a new package. Go on. DO IT NOW!
[19:02:07] [Client thread/INFO] [FML]: Forge Mod Loader has identified 3 mods to load
[19:02:07] [Client thread/INFO]: Reloading ResourceManager: Default, FMLFileResourcePack:Forge Mod Loader, FMLFileResourcePack:Minecraft Forge
[19:02:08] [Client thread/INFO] [FML]: Configured a dormant chunk cache size of 0
...
...

 

And I did try downloading a clean copy, as it suggests, and running setupDecompWorkspace again from scratch, but the error persists.

 

I recently moved all my mod code into proper packages (before I had only client and common packages) - could this have something to do with it? Also, the mod doesn't load on the proper Minecraft client when I build it either. Any help would be very appreciated, thank you.

add in your VM-Arguments

 

-Dfml.ignoreInvalidMinecraftCertificates=true

add in your VM-Arguments

 

-Dfml.ignoreInvalidMinecraftCertificates=true

That's already there.

Is your server.properties listing your server as offline or is online still equal to true?

 

That was what I had to change on mine to make it work.

Is your server.properties listing your server as offline or is online still equal to true?

 

That was what I had to change on mine to make it work.

I'm not running a server, I'm only running the Eclipse and normal Minecraft clients, and neither of them load the mod.

Well, I'm an idiot. It turns out that while repackaging my classes I somehow managed to remove the @Mod annotation on my main mod file. Sorry!