Now the script editor says there are duplicate edges, but i dont know how to find the duplicate edges, i went through my model several times but couldnt find anything.

I tried tweaking the maxpolycount, and have just fixed up any geometry that may be a problem-well at least to a newbie's eyes.

But anyway, still cant seem to convert from polygons BACK to Sub-Divisions, and im really anxious to continue the tutorial.