Unable to push database up to Heroku with heroku db:push -

so reason i'm unable push local database onto heroku. think it's trying load development database in sqlite3 though have postgresql set in gemfile production environment. wondering how can fix this?

error message:

sending schema c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/rubygems/custo m_require.rb:36:in `require': loaderror: cannot load such file -- sqlite3 (seque l::adapternotfound)         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/r ubygems/custom_require.rb:36:in `require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/adapters/sqlite.rb:1:in `<top (required)>'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/r ubygems/custom_require.rb:36:in `require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/r ubygems/custom_require.rb:36:in `require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:249:in `block in tsk_require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:72:in `block in check_requiring_thread'         <internal:prelude>:10:in `synchronize'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:69:in `check_requiring_thread'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:249:in `tsk_require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/database/connecting.rb:25:in `adapter_class'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/database/connecting.rb:54:in `connect'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:119:in `connect'         c:/program files (x86)/heroku/vendor/gems/taps-0.3.24/lib/taps/sche ma.rb:17:in `dump_table'         c:/program files (x86)/heroku/vendor/gems/taps-0.3.24/bin/schema:32 :in `<main>' c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/rubygems/custo m_require.rb:36:in `require': loaderror: cannot load such file -- sqlite3 (seque l::adapternotfound)         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/r ubygems/custom_require.rb:36:in `require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/adapters/sqlite.rb:1:in `<top (required)>'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/r ubygems/custom_require.rb:36:in `require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/r ubygems/custom_require.rb:36:in `require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:249:in `block in tsk_require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:72:in `block in check_requiring_thread'         <internal:prelude>:10:in `synchronize'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:69:in `check_requiring_thread'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:249:in `tsk_require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/database/connecting.rb:25:in `adapter_class'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/database/connecting.rb:54:in `connect'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:119:in `connect'         c:/program files (x86)/heroku/vendor/gems/taps-0.3.24/lib/taps/sche ma.rb:17:in `dump_table'         c:/program files (x86)/heroku/vendor/gems/taps-0.3.24/bin/schema:32 :in `<main>' c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/rubygems/custo m_require.rb:36:in `require': loaderror: cannot load such file -- sqlite3 (seque l::adapternotfound)         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/r ubygems/custom_require.rb:36:in `require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/adapters/sqlite.rb:1:in `<top (required)>'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/r ubygems/custom_require.rb:36:in `require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/r ubygems/custom_require.rb:36:in `require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:249:in `block in tsk_require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:72:in `block in check_requiring_thread'         <internal:prelude>:10:in `synchronize'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:69:in `check_requiring_thread'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:249:in `tsk_require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/database/connecting.rb:25:in `adapter_class'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/database/connecting.rb:54:in `connect'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:119:in `connect'         c:/program files (x86)/heroku/vendor/gems/taps-0.3.24/lib/taps/sche ma.rb:17:in `dump_table'         c:/program files (x86)/heroku/vendor/gems/taps-0.3.24/bin/schema:32 :in `<main>' c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/rubygems/custo m_require.rb:36:in `require': loaderror: cannot load such file -- sqlite3 (seque l::adapternotfound)         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/r ubygems/custom_require.rb:36:in `require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/adapters/sqlite.rb:1:in `<top (required)>'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/r ubygems/custom_require.rb:36:in `require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/r ubygems/custom_require.rb:36:in `require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:249:in `block in tsk_require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:72:in `block in check_requiring_thread'         <internal:prelude>:10:in `synchronize'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:69:in `check_requiring_thread'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:249:in `tsk_require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/database/connecting.rb:25:in `adapter_class'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/database/connecting.rb:54:in `connect'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:119:in `connect'         c:/program files (x86)/heroku/vendor/gems/taps-0.3.24/lib/taps/sche ma.rb:17:in `dump_table'         c:/program files (x86)/heroku/vendor/gems/taps-0.3.24/bin/schema:32 :in `<main>' schema:        100% |==========================================| time: 00:00:07 c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/rubygems/custo m_require.rb:36:in `require': loaderror: cannot load such file -- sqlite3 (seque l::adapternotfound)         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/r ubygems/custom_require.rb:36:in `require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/adapters/sqlite.rb:1:in `<top (required)>'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/r ubygems/custom_require.rb:36:in `require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/site_ruby/1.9.1/r ubygems/custom_require.rb:36:in `require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:249:in `block in tsk_require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:72:in `block in check_requiring_thread'         <internal:prelude>:10:in `synchronize'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:69:in `check_requiring_thread'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:249:in `tsk_require'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/database/connecting.rb:25:in `adapter_class'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/database/connecting.rb:54:in `connect'         c:/program files (x86)/heroku/ruby-1.9.2/lib/ruby/gems/1.9.1/gems/s equel-3.20.0/lib/sequel/core.rb:119:in `connect'         c:/program files (x86)/heroku/vendor/gems/taps-0.3.24/lib/taps/sche ma.rb:39:in `indexes_individual'         c:/program files (x86)/heroku/vendor/gems/taps-0.3.24/bin/schema:36 :in `<main>'  !    heroku client internal error.  !    search at: https://help.heroku.com  !    or report bug at: https://github.com/heroku/heroku/issues/new      error:       unexpected nil (okjson::parsererror)     backtrace:   c:/program files (x86)/heroku/vendor/gems/taps-0.3.24/lib/vendo r/okjson.rb:82:in `valparse'                  c:/program files (x86)/heroku/vendor/gems/taps-0.3.24/lib/vendo r/okjson.rb:64:in `textparse'                  c:/program files (x86)/heroku/vendor/gems/taps-0.3.24/lib/vendo r/okjson.rb:43:in `decode'                  c:/program files (x86)/heroku/vendor/gems/taps-0.3.24/lib/taps/ operation.rb:419:in `push_indexes'                  c:/program files (x86)/heroku/vendor/gems/taps-0.3.24/lib/taps/ operation.rb:408:in `block in run'                  c:/program files (x86)/heroku/vendor/gems/taps-0.3.24/lib/taps/ operation.rb:203:in `call'                  c:/program files (x86)/heroku/vendor/gems/taps-0.3.24/lib/taps/ operation.rb:203:in `catch_errors'                  c:/program files (x86)/heroku/vendor/gems/taps-0.3.24/lib/taps/ operation.rb:405:in `run'                  c:/program files (x86)/heroku/vendor/gems/taps-0.3.24/lib/taps/ cli.rb:172:in `clientxfer'                  c:/users/ptuan008/.heroku/client/lib/heroku/command/db.rb:192:i n `taps_client'                  c:/users/ptuan008/.heroku/client/lib/heroku/command/db.rb:30:in  `push'                  c:/users/ptuan008/.heroku/client/lib/heroku/command.rb:206:in ` run'                  c:/users/ptuan008/.heroku/client/lib/heroku/cli.rb:28:in `start '                  c:/program files (x86)/heroku/bin/heroku:29:in `<main>'      command:     heroku db:push     version:     heroku/toolbelt/2.39.3 (i386-mingw32) ruby/1.9.3