Liquibase plugin throws error while creating tasks

[vijay94]

NamedDomainObjectContainer#create(String) on Activity container cannot be executed in the current context.

Could not create domain object 'stage' (Activity)

I am getting this error with the below cofiguration.

liquibase {
    activities {
        register('stage') {
            arguments["changeLogFile"] = CHANGE_LOG_FILE
            arguments["url"] = DB_URL
            arguments["username"] = DB_USER_NAME
            arguments["password"] = DB_PASSWORD
            arguments["driver"] = "com.mysql.jdbc.Driver"
        }
    }
}