The mod does load but I do want to report this issue anyways. Using 3.12.2:

2013-04-10 06:01:01 [INFO] [STDERR] java.lang.NoSuchFieldException: loggerWindfall
2013-04-10 06:01:01 [INFO] [STDERR] at java.lang.Class.getField(Unknown Source)
2013-04-10 06:01:01 [INFO] [STDERR] at extrabiomes.module.amica.forestry.ForestryPlugin.preInit(ForestryPlugin.java:177)
2013-04-10 06:01:01 [INFO] [STDERR] at net.minecraftforge.event.ASMEventHandler_111_ForestryPlugin_preInit_Pre.invoke(.dynamic)
2013-04-10 06:01:01 [INFO] [STDERR] at net.minecraftforge.event.ASMEventHandler.invoke(ASMEventHandler.java:35)
2013-04-10 06:01:01 [INFO] [STDERR] at net.minecraftforge.event.EventBus.post(EventBus.java:103)
2013-04-10 06:01:01 [INFO] [STDERR] at extrabiomes.PluginManager.activatePlugins(PluginManager.java:17)
2013-04-10 06:01:01 [INFO] [STDERR] at extrabiomes.Extrabiomes.postInit(Extrabiomes.java:73)
2013-04-10 06:01:01 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2013-04-10 06:01:01 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
2013-04-10 06:01:01 [INFO] [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2013-04-10 06:01:01 [INFO] [STDERR] at java.lang.reflect.Method.invoke(Unknown Source)
2013-04-10 06:01:01 [INFO] [STDERR] at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:515)
2013-04-10 06:01:01 [INFO] [STDERR] at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
2013-04-10 06:01:01 [INFO] [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2013-04-10 06:01:01 [INFO] [STDERR] at java.lang.reflect.Method.invoke(Unknown Source)
2013-04-10 06:01:01 [INFO] [STDERR] at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
2013-04-10 06:01:01 [INFO] [STDERR] at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
2013-04-10 06:01:01 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
2013-04-10 06:01:01 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
2013-04-10 06:01:01 [INFO] [STDERR] at com.google.common.eventbus.EventBus.post(EventBus.java:267)
2013-04-10 06:01:01 [INFO] [STDERR] at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:165)
2013-04-10 06:01:01 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2013-04-10 06:01:01 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
2013-04-10 06:01:01 [INFO] [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2013-04-10 06:01:01 [INFO] [STDERR] at java.lang.reflect.Method.invoke(Unknown Source)
2013-04-10 06:01:01 [INFO] [STDERR] at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
2013-04-10 06:01:01 [INFO] [STDERR] at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
2013-04-10 06:01:01 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
2013-04-10 06:01:01 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
2013-04-10 06:01:01 [INFO] [STDERR] at com.google.common.eventbus.EventBus.post(EventBus.java:267)
2013-04-10 06:01:01 [INFO] [STDERR] at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:98)
2013-04-10 06:01:01 [INFO] [STDERR] at cpw.mods.fml.common.Loader.initializeMods(Loader.java:695)
2013-04-10 06:01:01 [INFO] [STDERR] at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:206)
2013-04-10 06:01:01 [INFO] [STDERR] at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:444)
2013-04-10 06:01:01 [INFO] [STDERR] at net.minecraft.client.MinecraftAppletImpl.func_71384_a(SourceFile:56)
2013-04-10 06:01:01 [INFO] [STDERR] at net.minecraft.client.Minecraft.run(Minecraft.java:729)
2013-04-10 06:01:01 [INFO] [STDERR] at java.lang.Thread.run(Unknown Source)
2013-04-10 06:01:01 [INFO] [ExtrabiomesXL] Successfully Loaded.

While we appreciate the report, in the future, please post these types of issues on the regular thread in the forums. This is mainly for development and suggestions and ideas by the team and the public. Bugs should be on the thread as most people don't come here and by posting them on the thread players can see if anyone else is having the issue and/or help resolve someone's issues. This is a known issue and has been reported on the thread. The cause is that EBXL cannot have an API that supports multiple versions of Forestry. As such, our API works with the stable version as the alpha and beta are in a continuous state of change.

That being said, SirSengir just provided an update to us for the API which Mister Fiber has seen and it will be in the next bug fix update. In the mean time you can delete the API out and it will work fine.