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Error: cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: codechicken/multipart/BlockMultipart Exit Code: -1

at cpw.mods.fml.common.Loader.loadMods(Loader.java:544) at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:208) at net.minecraft ...
GitHub

Error Loading Mods,failure message ;FreeCam by Zergatul (freecam) encountered an error during the common_setup event phase java.lang.NoClassDefFoundError: net/minecraftforge ...

im having an issue with this mod,when i try to launch mc with this mod,when mc opens,it says this,do you need crash text?