TEKKIT WORLD CRASH

[ZGameing]

Title: TEKKIT WORLD CRASH

Version: 3.1.3

OS: mac os x lion 10.8.3

Java Version: 7

Description of Problem:

When playing on a world it randomly crashes n shows me the log for only a split second then i close tekkit n when i try to enter the world agin it crashed n does not show me the log so i have no idea what is causing {it was ok with me on some creative worlds but it crashed on a survival world that I had 64 red matter legit so plz reply soon}

Error Messages:

Error Log:

no log