Which means, I do not think that there are more than 1000 materials in the file.
someone can give me a solution...........
I've had a detaied look at this, and I think it is related to an issue other than the number of scene materials for which there is an easy fix. There is a thread for reporting issues at http://render.otoy.com/forum/viewtopic.php?f=56&t=29556. Can you pls post your system details (as requested in the thread) in that thread, and I will rectify the problem.