sql - unable to migrate database on production while running rake task -

i developing small app download csv file(from give url) everyday , inject data(in csv file) database , load same data in webview. working perfect in local system.but when deployed heroku database injection csv file not working.

here code.

downloader.rake file

namespace :downloader desc "download file" task:downloading => :environment rails.logger.info("message task") download.destroy_all activerecord::base.connection.execute("delete sqlite_sequence name = 'downloads'") #**********some other code ************ end end 

schedule.rb file

set :environment, 'production'  every 1.minutes rake "downloader:downloading" end 

when run in production shows in log($tail -f log/production.log)

d, [2015-07-21t12:17:02.910529 #11740] debug -- :   download load (0.2ms)  select "downloads".* "downloads" e, [2015-07-21t12:17:02.910635 #11740] error -- : sqlite3::sqlexception: no such table: downloads: select "downloads".* "downloads" 

looks database not ready on heroku.

please veryify have installed mysql database application , run heroku run db:setup build schema , seed it.