Error While Create User

When i create user from admin it showing the following error…

Error 500

CDbCommand не удалось исполнить SQL-запрос: SQLSTATE[42000]: Syntax error or access violation: 1044 Access denied for user ‘user_name’@‘208.113.128.0/255.255.128.0’ to database ‘viaescort_db’

Please help me to solve the error…