So, when I bought minecraft about a few days ago and was happy about getting mods like feed the beast, but for whatever reason when I downloaded the launcher for the first time it gave me an error when downloading the sounds or assets and says cannot be moved since it already being used and idk what it means by that and I've tried to fix it myself and haven't been successful at it and now am kinda mad if this bug I got can be fixed as soon as possible. photos show what I mean