Hey Viper,
I just thought to myself, Oh, I can do this, ha ha  mine failed with the exact error.
I did a quick search and found this - much better image example then what I chose.

http://www.cambridgeincolour.com/tutorials/high-dynamic-range.htm

I'll try again after I finish my current project.. Yell at me if you find something better yourself.

Ciao
Dave