I wanted to contribute to this old post that I found by searching the forum because I was having the same problem, except that I wasn't trying to do an export to a c4d file, I was trying to use the "Comp camera into Cinema 4D" command in Cineware.
Having a tracked camera, I pressed the button and when I switched to C4D lite I didn't see the AE 3D Tracker Camera I was supposed to, according to what I read in the help. I closed C4D lite, selected the layer in the comp, pressed CTRL+E, went back to the comp, pressed the button again in Cineware, still nothing. However, what worked was to close C4D Lite, and with it closed, pressing the Comp camera etc button again. The next time I pressed CTRL+E it opened C4D Lite with the camera in it.