It sounds like you're missing a codec. Perhaps you selected a codec by mistake. Like the error message says, I'd double-check the Output Module you're using to make sure all the t's are crossed and the i's are dotted.
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA
Ummm the default render in AE doesn't use a codec , it's uncompressed lossless AVI unless I'm mistaken? I checked and all looks normal from here, I must have damaged the AVI plugin during system maintenance last week. Any idea what folder holds that plugin and how I can replace it with new ones?
I have similar problem, but not using any footage only still images, psd polaroid pic, tried it with .png too, but still same problem. Exported as MOV, not using OpenGL to render. Tried exporting in other formats and difference resolutions, but no difference.