create database tables problems when do installing for modx

i have problem in create tables when try to configure the modx , i use appserv version 2.6
and Server version: 6.0.4-alpha-community-log with MySQL client version: mysqlnd 5.0.4-dev - 080501 - $Revision: 1.17 $
but always give me database alert and no create for database tables .
my question how i can solve this problem to configure modx without problems and continue my work correctly