the shockwave 8.5 from
http://www.streetfighteronline.com/download.htm shold have solved this issue...
if not, then there is something else going on with the browser and/or the shockwave plugin
my advice.. even if you get that error, try to run the game the way you normally would... it would probably work without any further errors (@least that is the response i've been hearing from people)