Why do I get this error on one VPS but not the other?

[GiantNoob]

Ok, I'm new to this forum and don't have much experience coding with Java...

I have 2 VPS's, One is running Windows Server 2012 R2 Datacenter, and the other is Linux based.

On the Windows VPS, I am running a server/emulation software written in Java (obviously) and it works perfectly fine with no errors. I then went to setup the software on my new and beter VPS running Linux but that is when I got this error: Exception in thread "Thread-0" java.lang.NullPointerException

At first I though it was something I had done wrong with some installations so I refreshed the VPS but the same error occurs. I have also setup a couple of VPS's/VMs using whats left of my Microsoft Azure trial but the same error is occuring.
I cannot figure out why the software runs fine on my main PC and current Windows VPS but not on other VPS's

I didn't make this program so I can't edit the source. I would link to the source but for some reason with the link, the post is denied....

[Norm]

Also posted at: Why Do I Get This Error On One VPS But Not Others? - Java | Dream.In.Code

[trcooke]

And didn't include all the information here either. Some of the stack trace is missing.

Best head on over to Dream.In.Code for this one.