Render fails with .mov files

[Colteon]

I have 3 .mov files that I want in my comp, but when I add them, my render always fails. When I render it without those files, it goes through. These files are from Blender and rendered as QT animations so they are transparent.

[Andrew Yoole]

Try transcoding the files to a different format in Media Encoder, such as Quicktime ProRes 4444 with alpha, then replace them in your After Effects project.