Can't place a Robot on a Docking Station, works fine in single player.

... 15 more
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:174)
at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:276)
at cpw.mods.fml.common.asm.transformers.TerminalTransformer.transform(TerminalTransformer.java 14)
at org.objectweb.asm.ClassReader.(Unknown Source)
Caused by: java.lang.NullPointerException
... 13 more
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:188)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.particle.EntityFX
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:335)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659)
at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)
at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:9)
at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:60)
at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:554)
at net.minecraft.server.management.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:376)
at buildcraft.transport.BlockGenericPipe.func_149727_a(BlockGenericPipe.java:798)
at buildcraft.core.ItemRobot.createRobot(ItemRobot.java:43)
java.lang.NoClassDefFoundError: net/minecraft/client/particle/EntityFX

Same issue on forge 1231.

1.7.10 Cauldron (CauldronInstallerPatch-1.1231.01.208 - 1.7.10 Forge 1231 patch)
When trying to put the robot on station

[02:58:57 WARN]: java.lang.NoClassDefFoundError: net/minecraft/client/particle/EntityFX
[02:58:57 WARN]: at buildcraft.core.ItemRobot.createRobot(ItemRobot.java:43)
[02:58:57 WARN]: at buildcraft.transport.BlockGenericPipe.func_149727_a(BlockGenericPipe.java:798)
[02:58:57 WARN]: at net.minecraft.server.management.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:456)
[02:58:57 WARN]: at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:875)
[02:58:57 WARN]: at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:60)
[02:58:57 WARN]: at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:9)
[02:58:57 WARN]: at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:244)
[02:58:57 WARN]: at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:173)
[02:58:57 WARN]: at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:980)
[02:58:57 WARN]: at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:423)
[02:58:57 WARN]: at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:798)
[02:58:57 WARN]: at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:658)
[02:58:57 WARN]: at java.lang.Thread.run(Thread.java:745)
[02:58:57 WARN]: Caused by: java.lang.ClassNotFoundException: net.minecraft.client.particle.EntityFX
[02:58:57 WARN]: at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:101)
[02:58:57 WARN]: at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
[02:58:57 WARN]: at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
[02:58:57 WARN]: ... 13 more

Can anyone provide full stacktrace of that?

If you tell me how...this was all the forge writes, In all logs it is like this. I tried more times but nothing more except this last line:

[Server thread/WARN] [/]: Caused by: java.lang.NullPointerException

I generated it on my own. It is now fixed, waiting for merge.