Ok, I’m here to help others who have this problem too.
I’ve read all the discussions in here and here is my fix
I own a macbook pro 2.8ghz 4gb ram, snow leopard.Ran a clean install of cs4 on it and had got the same error. Never previously had cs3 or anything in it.
My workflow was to create everything in after effects and cut it in premiere pro then export.
Until I got the fatal error.
I first tried to import my premiere pro project in after effects, but I had missing media because it was trying to refer to my ae project and vice versa, and everything got jarbled and missing.
YOu can’t really put a cookie into a jar and then put all of that back into the cookie… yahhh. I’m confused too.
The next thing I did was go to the media core folder and move the plugins out like in the earlier post and that worked! I just moved them to after effects plugins folder. I then re-opened premiere pro and apparantly I was using a plugin in premiere pro that I had forgotten about.
It was trapcode shine. I could have just used this in ae, but I did it later in premiere pro.
Anyways I just hit ok with the missing plugin, exported into media encoder and it started working!
Thanks everyone.
Hope this helps all the others out there.