Assuming you're speaking of the "Exception 0xc0000005 arised" error:
The error basically tells you "something went wrong". And yes, it's as generic as that. There are countless reasons that can cause it.
You need to dig a lot deeper and apply actual debugging techniques to go anywhere near finding out what's the cause of the issue. (If you're lucky, it's a nullpointer).
Most common causes when setting up a server are:
Incompatible Client <-> Server files
Out of date client database file (omi.tex)
Invalid HackShield installation
Corrupt resource files
A definite and always working solution for all scenarios cannot be given for this error. It's too broad.
#Closed (if you have further information regarding the error, search first and then create a new thread)