Rendering problem - Lights

Hello PTC Community,

This is my first thread and i have no idea were to post, i just got lost in my rendering problem and had to ask someone to help me, i hope someone will help me here.

So i have a part, went through this rendering tutorial and i started rendering with an output of an .jpeg file. I had maximum on all options and i've set all parameters and lights and scenes as i pleased.

Now this messege showed up just when i clicked "Render window". I have no idea why, i have no idea what i've pressed...

By the way, i have the student version PTC wildfire 5.0 installed. If there is some information you need to know to help me please do tell me.

This is the tutorial i followed: http://www.youtube.com/watch?v=gLXz5Nwf160

Thanks in advance, cheers!

/ Emel