---- Minecraft Crash Report ----

WARNING: coremods are present:
MMFMLCorePlugin (MultiMine-1.9.jar)
LoadingPlugin (RandomThings-MC1.9-3.6.8.1.jar)
Contact their authors BEFORE contacting forge

// You're mean.

Time: 3/26/16 5:08 PM
Description: There was a severe problem during mod loading that has caused the game to fail

net.minecraftforge.fml.common.LoaderException: java.lang.IllegalAccessError: tried to access field net.minecraftforge.common.config.Property.comment from class cyano.basemetals.BaseMetals
at net.minecraftforge.fml.common.LoadController.transition(LoadController.java:172)
at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:559)
at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:240)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:434)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:346)
at net.minecraft.client.main.Main.main(SourceFile:124)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.IllegalAccessError: tried to access field net.minecraftforge.common.config.Property.comment from class cyano.basemetals.BaseMetals
at cyano.basemetals.BaseMetals.preInit(BaseMetals.java:141)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:560)
at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
at com.google.common.eventbus.EventBus.post(EventBus.java:275)
at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:221)
at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:199)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
at com.google.common.eventbus.EventBus.post(EventBus.java:275)
at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:128)
at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:556)
... 10 more

A detailed walkthrough of the error, its code path and all known details is as follows:

-- System Details --
Details:
Minecraft Version: 1.9
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.8.0_73, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 180794792 bytes (172 MB) / 307576832 bytes (293 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP 9.23 Powered by Forge 12.16.0.1811 31 mods loaded, 31 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCH mcp{9.19} Minecraft Coder Pack
UCH FML{8.0.99.99} Forge Mod Loader
UCH Forge{12.16.0.1811} Minecraft Forge
UCH AutoSapling{1.3} [AutoSapling](AutoSapling 1.3 MC1.9.jar)
UCE basemetals{2.0.1} Base Metals
UCH betterbuilderswands{0.5.2} Better Builder's Wands
UCH BiomesOPlenty{4.0.0} Biomes O' Plenty
UCH buildingbrickscompatvanilla{1.9-1.4.4} Building Bricks Vanilla Compat
UCE buildingbricks{1.9-1.4.4} Building Bricks
UCH claybucket{1.0} Clay Bucket
UCE cyclopscore{0.5.3} Cyclops Core
UCE colossalchests{1.3.3} Colossal Chests
UCH flatcoloredblocks{mc1.9-v2.2} Flat Colored Blocks
UCH gravestone{1.2.1} [Gravestone](Gravestone Mod 1.2.1.jar)
UCE itemscroller{0.2.1} Item Scroller
UCH JEI{3.1.0.170} Just Enough Items
UCH journeymap{1.9-5.1.5b3} JourneyMap
UCH lteleporters{1.1.1} Lemon's Simple Teleporters
UCH ModNameTooltip{1.2.0} Mod Name Tooltip
UCH morefood{1.1g} More Food
UCH AS_MultiMine{1.5.2} Multi Mine
UCH Neat{GRADLE:VERSION-GRADLE:BUILD} [Neat](Neat 1.2-4.jar)
UCH packingtape{0.5} [Packing Tape](Packing Tape-0.5.jar)
UCH planttech{1.3.0} [Planttech](planttech-1.3.0 - 1.9.jar)
UCH progressiveautomation{1.6.36} Progressive Automation
UCH Psi{beta-29} Psi
UCH randomthings{3.6.8.1} Random Things
UCH AS_Ruins{15.7} Ruins Spawning System
UCH simplegrinder{1.122.A19} Simple Grinder
UCH AS_UpdateCheck{1.1.7} AtomicStryker Update Check Mod
UCH WIT{1.0.8} WIT
Loaded coremods (and transformers):
MMFMLCorePlugin (MultiMine-1.9.jar)
atomicstryker.multimine.common.fmlmagic.MMTransformer
LoadingPlugin (RandomThings-MC1.9-3.6.8.1.jar)
lumien.randomthings.asm.ClassTransformer
GL info: ' Vendor: 'NVIDIA Corporation' Version: '3.0.0' Renderer: 'GeForce 8200/PCI/SSE2/3DNOW!'

Please don't just dump your crash logs here. I have no context, so I don't know what you did to cause this crash.
I don't even see in what way CyclopsCore is related to this, as I only see cyano.basemetals.BaseMetals in the stack.

I am also having a crash on startup with Forge 1.9-12.16.0.1811. I did some debugging and it appears that CyclopseCore will always crash with java.lang.IllegalAccessError starting with version 1805 (1804 works). So if you look at what changed between 1804 and 1805 I'm sure you'll be able to figure out what the problem is.

I have uploaded my entire crash log here: http://paste.ee/p/fyjeM

Let me know if you need more information.

Seems to be related to #13, Forge is doing some refactoring it seems, so mods are bound to break during this period. I'll look into it soon.

Fixed in b0df023, release coming soon.