ASSERT in memval_simple client

Created by: mcgrady1

Hi all, I tried to use memval_simple.c, and got the error: Data file /home/ubuntu/Dynamorio/dynamorio/bin32/../api/bin/memval_simple.xxxx.03169.0000.log created ASSERT FAILURE: /home/ubuntu/Dynamorio/dynamorio/api/samples/memval_simple.c:147: write_base <= write_ptr ()

I compiled the source code on ubuntu 14.04, 32bit

write_base buffer is used to store the value of memory address?

Anyone can help me solve the problem?