With IC2 build 297, I get this crash.
[2013-12-13 10:46:23] [INFO] [STDERR] net.minecraft.util.ReportedException: Ticking tile entity
[2013-12-13 10:46:23] [INFO] [STDERR] at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:674)
[2013-12-13 10:46:23] [INFO] [STDERR] at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
[2013-12-13 10:46:23] [INFO] [STDERR] at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:175)
[2013-12-13 10:46:23] [INFO] [STDERR] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
[2013-12-13 10:46:23] [INFO] [STDERR] at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)
[2013-12-13 10:46:23] [INFO] [STDERR] Caused by: java.lang.AbstractMethodError: phero.mods.advancedreactors.tileentity.TileEntityNuclearReactorElectric.addEmitHeat(I)V
[2013-12-13 10:46:23] [INFO] [STDERR] at ic2.core.item.reactor.ItemReactorVent.processChamber(ItemReactorVent.java:45)
[2013-12-13 10:46:23] [INFO] [STDERR] at phero.mods.advancedreactors.tileentity.TileEntityNuclearReactor.processChambers(TileEntityNuclearReactor.java:338)
[2013-12-13 10:46:23] [INFO] [STDERR] at phero.mods.advancedreactors.tileentity.TileEntityNuclearReactor.func_70316_g(TileEntityNuclearReactor.java:312)
[2013-12-13 10:46:23] [INFO] [STDERR] at phero.mods.advancedreactors.tileentity.TileEntityNuclearReactorElectric.func_70316_g(TileEntityNuclearReactorElectric.java:49)
[2013-12-13 10:46:23] [INFO] [STDERR] at net.minecraft.world.World.func_72939_s(World.java:2209)
[2013-12-13 10:46:23] [INFO] [STDERR] at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:550)
[2013-12-13 10:46:23] [INFO] [STDERR] at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:668)
[2013-12-13 10:46:23] [INFO] [STDERR] ... 4 more
[2013-12-13 10:46:23] 2013-12-13 10:46:23 [SEVERE] [Minecraft-Server] Encountered an unexpected exception ReportedException
[2013-12-13 10:46:23] net.minecraft.util.ReportedException: Ticking tile entity
[2013-12-13 10:46:23] at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:674)
[2013-12-13 10:46:23] at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
[2013-12-13 10:46:23] at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:175)
[2013-12-13 10:46:23] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
[2013-12-13 10:46:23] at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)
[2013-12-13 10:46:23] Caused by: java.lang.AbstractMethodError: phero.mods.advancedreactors.tileentity.TileEntityNuclearReactorElectric.addEmitHeat(I)V
[2013-12-13 10:46:23] at ic2.core.item.reactor.ItemReactorVent.processChamber(ItemReactorVent.java:45)
[2013-12-13 10:46:23] at phero.mods.advancedreactors.tileentity.TileEntityNuclearReactor.processChambers(TileEntityNuclearReactor.java:338)
[2013-12-13 10:46:23] at phero.mods.advancedreactors.tileentity.TileEntityNuclearReactor.func_70316_g(TileEntityNuclearReactor.java:312)
[2013-12-13 10:46:23] at phero.mods.advancedreactors.tileentity.TileEntityNuclearReactorElectric.func_70316_g(TileEntityNuclearReactorElectric.java:49)
[2013-12-13 10:46:23] at net.minecraft.world.World.func_72939_s(World.java:2209)
[2013-12-13 10:46:23] at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:550)
[2013-12-13 10:46:23] at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:668)
[2013-12-13 10:46:24] ... 4 more
Can't even place a Fuel Rod inside the nuclear reactor, the crash happened as soon as I placed it.