I have recently tried to create a new modpack for my friends and i, and i followed all instructions to create a pack. ive done one like this before with no hiccups, but now i cant fully install the pack because there is an error saying "error extracting file - *modpack name* - contact mod author". it gets to 28 percent on mod installation and says this, and i am forced to delete the pack and retry. i am using dropbox and have around 20 mods in my pack.