Minecraft Version 1.12.2
Forge Version: 14.23.2.2617

java.lang.RuntimeException: Invalid shaped ore recipe: IBI, ICI, IBI, I, ingotConductiveIron, B, null, C, jackyy.exchangers.item.enderio.ItemEIOExchangerCoreT1@116f2e65,
at net.minecraftforge.common.crafting.CraftingHelper.parseShaped(CraftingHelper.java:344)
at net.minecraftforge.fml.common.registry.GameRegistry.addShapedRecipe(GameRegistry.java:202)
at jackyy.exchangers.Recipes.init(Recipes.java:190)
at jackyy.exchangers.proxy.CommonProxy.onRecipeRegistry(CommonProxy.java:41)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_581_CommonProxy_onRecipeRegistry_Register.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus$1.invoke(EventBus.java:143)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179)
at net.minecraftforge.registries.GameData.fireRegistryEvents(GameData.java:746)
at net.minecraftforge.common.crafting.CraftingHelper.loadRecipes(CraftingHelper.java:622)
at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:718)
at net.minecraftforge.fml.server.FMLServerHandler.finishServerLoading(FMLServerHandler.java:107)
at net.minecraftforge.fml.common.FMLCommonHandler.onServerStarted(FMLCommonHandler.java:337)
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:219)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
at java.lang.Thread.run(Thread.java:748)

I am aware of the issue, Exchangers currently doesn't work with Ender IO on 1.11+, but it's fixed in the dev branch, new version will be out in a few days.

Fixed in 2.7.