I figured it out! Go to your server folder. Open the "config" folder. Open "CCTurtle.cfg" with WordPad. Change the line to read "B:turtlesNeedFuel=false"
Do that, or supply the turtle with fuel somehow (I don't know how )
Hope that helped!
I sort of had the same problem. I had a different error like it. Try turning "Items Animated" to 'off' in Video Settings. That stopped crashing it for me.