FIrst off this thread probably ought to be moved to a different area, second, uh...you're going to have to supply your code and more info. That error obviously means you're trying to display an entity that doesn't exist.
I reccomend you click on the words HomeSpun Gold in my sig and go to that page and click the picture to download HomeSpun. Play around with using it to set up your basic worlds and then click on either 1st person or third person code to generate the needed Blitz3d code! It's a great learning tool for the beginner. Try that then come back and post your questions in the beginner forum or under the Blitz3d topic area!
I reccomend you click on the words HomeSpun Gold in my sig and go to that page and click the picture to download HomeSpun. Play around with using it to set up your basic worlds and then click on either 1st person or third person code to generate the needed Blitz3d code! It's a great learning tool for the beginner. Try that then come back and post your questions in the beginner forum or under the Blitz3d topic area!