Exception Error on Connect

[MC_GUNNER]

I was playing my faveroute server Classic on Graal V4 and i was lagging abit so i reconnected and this message appeared saying Error Exception E06D7363 And i was shocked because this normally doesn't happen and i didn't know what caused that to appear or anything so i tested it again and reconnected, and the same message came up. And i know that my computor isn't to fault because my computor has been working fine and is the latest windows version Xp. So look for yourself and decide what this bug is because i really wasn't sure why this message came up and what caused it to appear on my screen.
website url is their so you can check for yourself --- >
The V4 Bug screenshot