[Serusers] problem in starting mysql module in ser !

[zhu]

hello, guys:
I try to use freeradius and ser. when i start ser, the following 
messages came out and reload mysql three times and finally stop at mydql 
module:

get_connection(): Connection not found in the pool
 0(0) release_connection(): Removing connection from the pool
 0(0) get_connection(): Connection not found in the pool
 0(0) release_connection(): Removing connection from the pool

 0(0) find_mod_export: found <db_use_table> in module mysql 
[/usr/local/lib/ser/modules/mysql.so] 0(0) find_mod_export: found 
<db_init> in module mysql [/usr/local/lib/ser/modules/mysql.so]
 0(0) find_mod_export: found <db_close> in module mysql 
[/usr/local/lib/ser/modules/mysql.so]
 0(0) find_mod_export: found <db_query> in module mysql 
[/usr/local/lib/ser/modules/mysql.so]
 0(0) find_mod_export: found <db_raw_query> in module mysql 
[/usr/local/lib/ser/modules/mysql.so] 0(0) find_mod_export: found 
<db_free_result> in module mysql [/usr/local/lib/ser/modules/mysql.so]
 0(0) find_mod_export: found <db_insert> in module mysql 
[/usr/local/lib/ser/modules/mysql.so]
 0(0) find_mod_export: found <db_delete> in module mysql 
[/usr/local/lib/ser/modules/mysql.so]
 0(0) find_mod_export: found <db_update> in module mysql 
[/usr/local/lib/ser/modules/mysql.so]
any firend knows how to solve it. thanks lot!
zhu