things that make my server crash

[ceddy4395]

Title: things that make my server crash

Version: 3.1.3

OS: mac osx 10.7.5

Java Version: java 7

Description of Problem:

can somebody tell me what things in tekkit might be crashing the server, because I had already build some cool stuff and then place something down which crashes the server.

so please tell me what things it are and how I can stop it from crashing the server.

Error Messages:

Error Log:

[theprolo]

Give us the error log, that will tell us how to fix it.