Import image sequence not working

Hi Coo's

I have exported from AE an image sequence (1 - 47) with an alpha channel (it's a lightning strike, transparent background). Imported through materials in the color and luminance channel, just trying both to see what happens and the test render always says at least one image is missing. When I hit calculate in the material editor animation menu it always says start frame is one and end frame is one. If I manually type in end frame is 47 it wont render but it does render if only one frame is listed. Is there a problem in naming conventions tha prevent C4D from picking up the other frames? Each frame is listed 01 thru to 47 with an empty space before the number.

Thanks in advance

Gunter