CodeChickenCore Mod is necessary if you are going to install any of ChickenBones mods because it contains all the classes that all ChickenBones mods use.
See also: Wireless Redstone Chicken Bones Edition Mod
This goes in the COREMODS folder.
Download Links:
Older versions:
For 1.5.2
http://dl.mod-minecraft.net/download.php?file=46286e43c7cd1ed054ecbcb6ee21921a
For 1.6.2
http://dl.mod-minecraft.net/download.php?file=76b862a955bce27f6748647e617653bf
For 1.6.4
http://dl.mod-minecraft.net/download.php?file=d8800f201da7fe01ba1f8127a9a568ff
For 1.7.2
http://dl.mod-minecraft.net/download.php?file=f22c02ff4352f263f3c8023022f28c91
For 1.7.10
http://dl.mod-minecraft.net/download.php?file=78db8693709d26b1128b872a747c1188
For 1.8
http://dl.mod-minecraft.net/download.php?file=c1ab2d94b68cb10d88971f9b0a87e31f
For 1.9
http://dl.mod-minecraft.net/download.php?file=e00daf9a53399bca9f1a87c14d2e61bf
For 1.9.4
http://dl.mod-minecraft.net/download.php?file=1a4fa6c655e05034b84a3cb452c66c9e
For 1.10.2
http://dl.mod-minecraft.net/download.php?file=a558b3481b610682fcc35842b99f7955
Credits: chicken_bones