This is a forge problem heres what you need:http://files.minecraftforge.net/fmllibs/fml_libs15.zip put all the files contained in this zip file into your your modpack lib.Now how to find lib go to start menu type in "run" then type %appdata% then click .technic then click your modpack then lib and then just paste all the files from the thing i gave you to download in your lib folder.There your done enjoy your modpack,hope i helped :)