SecurityError: Error #2148

Hi,

I'm having trouble playing an swf file in my website and i cant work out whats wrong. I'm using Dreamweaver CS4 along with Flash CS4 after i've added the swf (in the root folder i have the .fla file, the .swf file and the flvplayback skin) but i keep getting the 'SecurityError: Error #2148' error message.

Im confused because when i test the published html file from flash, it works great, same when i double click the .swf, works great but testing the page from Dreamweaver i get the error message. What does this mean and how can i solve this?

Thanks for your help.