FOSS gamedev and creative worlds

While I was on the celeron.55.lt server I got the following error:

Some exception, what()="Access violation"

I've had this 2 times now on the server and it disconnects you once it comes up, not had it on my own server so not really sure what it is.

i get this same error, except i get it before i'm even able to log in. sometimes i'm able to log in but only for a split second.