YOu need to set the resolution in the C4D render settings. By default it's set to 800x600. Read the help.
> When I try to work with a C4D file...
I think that you may be misunderstanding how you are intended to use items from Cinema 4D in After Effects. You should not be trying to transform (move, etc.) the layer in After Effects to create animation; you should be animating in Cinema 4D and then bringing the item into After Effects for compositing---moving cameras and lights around in the scene, etc.
There are lots of resources to learn about this feature set here:
Gray Scale Gorilla (one of the links) shows that working with a camera in After Effects IS POSSIBLE. However, I keep getting the layer size error when i try to move the camera when following the video tutorial. Can anyone help? I adjusted the render settings in C4D but still get the error.
What is the size of the solid layer you've applied the Cineware effect to?
What size is your composition?
Have you pressed reset on the transform values of your solid layer?
We ended up merging the new old C4D file to a new C4D file created in a comp instead of creating a C4D file in the project space of AE. This seems to have stemmed from a composition size/layer size issue.
But to answer your question: both layer size and comp size were adjust to 1920x1080 and 24 fps and we reset the transform values. Even so the scale on the C4D layer was red and we kept receiving the error.
My coworker figured out the merge function and once we made a new C4D file in the preexisting comp we could use AE cameras fine without the layer error.
How odd. Glad you got it working!