Server crash when using RR wrench on RR cable

When trying to wrench a RR Inventory cable using the RR wrench, while BuildCraft isn't installed, server crashes:
#!

[20:00:15 ERROR]: Encountered an unexpected exception
java.lang.NoClassDefFoundError: buildcraft/api/tools/IToolWrench
>       at router.reborn.block.BlockInventoryCable.func_149727_a(BlockInventoryCable.java:242) ~[BlockInventoryCable.class:?]
>       at net.minecraft.server.management.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:462) ~[mx.class:?]
>       at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:853) ~[nh.class:?]
>       at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:60) ~[jo.class:?]
>       at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:9) ~[jo.class:?]
>       at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:244) ~[ej.class:?]
>       at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:173) ~[nc.class:?]
>       at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:991) ~[MinecraftServer.class:?]
>       at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:431) ~[lt.class:?]
>       at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:809) ~[MinecraftServer.class:?]
>       at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:669) [MinecraftServer.class:?]
>       at java.lang.Thread.run(Thread.java:745) [?:1.7.0_85]
Caused by: java.lang.ClassNotFoundException: buildcraft.api.tools.IToolWrench
>       at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:101) ~[launchwrapper-1.12.jar:?]
>       at java.lang.ClassLoader.loadClass(ClassLoader.java:425) ~[?:1.7.0_85]
>       at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ~[?:1.7.0_85]
>       ... 12 more
[20:00:15 ERROR]:       Cause of unexpected exception was
java.lang.ClassNotFoundException: buildcraft.api.tools.IToolWrench
>       at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:101) ~[launchwrapper-1.12.jar:?]
>       at java.lang.ClassLoader.loadClass(ClassLoader.java:425) ~[?:1.7.0_85]
>       at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ~[?:1.7.0_85]
>       at router.reborn.block.BlockInventoryCable.func_149727_a(BlockInventoryCable.java:242) ~[BlockInventoryCable.class:?]
>       at net.minecraft.server.management.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:462) ~[mx.class:?]
>       at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:853) ~[nh.class:?]
>       at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:60) ~[jo.class:?]
>       at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:9) ~[jo.class:?]
>       at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:244) ~[ej.class:?]
>       at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:173) ~[nc.class:?]
>       at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:991) ~[MinecraftServer.class:?]
>       at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:431) ~[lt.class:?]
>       at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:809) ~[MinecraftServer.class:?]
>       at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:669) [MinecraftServer.class:?]
>       at java.lang.Thread.run(Thread.java:745) [?:1.7.0_85]
[20:00:15 ERROR]: This crash report has been saved to: /home/wwm/./crash-reports/crash-2015-11-04_20.00.15-server.txt
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