i completed the above quest (at the time it had me get cobble,gravel,sand,fine sand and the crash after it only shows cobble which is odd but whatever) and i immediately crashed (client only)

not sure if this is where this report should go. let me know if i should be posting this in a specific mods bugtracker and ill repost it there

Crash Report
http://pastebin.com/NqYAE7f2
Game Output (tab of launcher)
http://pastebin.com/N049jFNH