How to archive user messages in ejabberd in sql database?

Hi we had used ejabberd 16.04 version for chat application, and i can perform user creation and sending message now what i need is i want to archive messages but i couldn't so kindly look into below code and guide me where i went wrong?

Some of the my ejabberd code:

auth_method: sql
default_db: sql 

Database connection:

##
## MySQL server:
##
sql_type: mysql
sql_server: "127.0.0.1"
sql_database: "ejabberd"
sql_useame: "root"
sql_password: "1231231213"
modules: mod_mam: db_type: sql

Error log:

2016-07-18 12:36:49.039 [waing] <0.26092.2>@ejabberd_config:default_db:884 Module 'mod_carboncopy' doesn't support database 'sql' defined in option 'default_db', using 'mnesia' as fallback