Thread: error 12003 in publishing

Hi,
I've just added several pics to a page which was publishing fine earlier this morning. http://www.kalonacreativity.co.uk/kal_sculpture.html

Now I am getting this message;

Internet exception Error 12003
200 type set to I
227Entering passive mode (numbers)
550 images/bv01634.png Overwrite denied

What is causing this, and how do I get it working again?
many thanks,
Kal

actually- just to add to that- it's every page that won't publish, just the bv.png numbers change each time...not good.