Cannot Start asterisk : Already have an application 'MYSQL'


I had installed Asterisk 1.8 in centos 5.7.
I had selected following: app_mysql, app_saycountpl, cdr_mysql, format_mp3, res_config_mysql while doing ‘make menuselect’

I cannot start asterisk due to following error:

= Parsing ‘/etc/asterisk/app_mysql.conf’: == Found
Already have an application ‘MYSQL’

Please, can any one help me

Thanks in advance

Any body please help me, what cause for this error