heroku cronjob schedular addon error while trying heroku addons:open scheduler

manish@ubuntu:~/project/myapp$  heroku addons:open scheduler

Opening scheduler:standard for myapp... failed ! Heroku client internal error. ! Search for help at: https://help.heroku.com ! Or report a bug at: http://ift.tt/1cxnP4P

Error:       ERROR: Failed to build gem native extension.

/usr/bin/ruby1.9.1 extconf.rb

Ruby version is too old

extconf failed, exit code 1

Gem files will remain installed in /home/gagan/.rvm/gems/ruby-2.1.5/gems/byebug-4.0.5 for inspection. Results logged to /home/gagan/.rvm/gems/ruby-2.1.5/extensions/x86-linux/1.9.1/byebug-4.0.5/gem_make.out (Gem::Ext::BuildError) Backtrace: /usr/local/lib/site_ruby/1.9.1/rubygems/ext/builder.rb:89:in run' /usr/local/lib/site_ruby/1.9.1/rubygems/ext/ext_conf_builder.rb:38:inblock in build' /usr/lib/ruby/1.9.1/tempfile.rb:320:in open' /usr/local/lib/site_ruby/1.9.1/rubygems/ext/ext_conf_builder.rb:17:inbuild' /usr/local/lib/site_ruby/1.9.1/rubygems/ext/builder.rb:161:in block (2 levels) in build_extension' /usr/local/lib/site_ruby/1.9.1/rubygems/ext/builder.rb:160:inchdir' /usr/local/lib/site_ruby/1.9.1/rubygems/ext/builder.rb:160:in block in build_extension' <internal:prelude>:10:insynchronize' /usr/local/lib/site_ruby/1.9.1/rubygems/ext/builder.rb:159:in build_extension' /usr/local/lib/site_ruby/1.9.1/rubygems/ext/builder.rb:198:inblock in build_extensions' /usr/local/lib/site_ruby/1.9.1/rubygems/ext/builder.rb:195:in each' /usr/local/lib/site_ruby/1.9.1/rubygems/ext/builder.rb:195:inbuild_extensions' /usr/local/lib/site_ruby/1.9.1/rubygems/specification.rb:1436:in block in build_extensions' /usr/local/lib/site_ruby/1.9.1/rubygems/user_interaction.rb:45:inuse_ui' /usr/local/lib/site_ruby/1.9.1/rubygems/specification.rb:1434:in build_extensions' /usr/local/lib/site_ruby/1.9.1/rubygems/stub_specification.rb:60:inbuild_extensions' /usr/local/lib/site_ruby/1.9.1/rubygems/basic_specification.rb:56:in contains_requirable_file?' /usr/local/lib/site_ruby/1.9.1/rubygems/specification.rb:925:inblock in find_inactive_by_path' /usr/local/lib/site_ruby/1.9.1/rubygems/specification.rb:924:in each' /usr/local/lib/site_ruby/1.9.1/rubygems/specification.rb:924:infind' /usr/local/lib/site_ruby/1.9.1/rubygems/specification.rb:924:in find_inactive_by_path' /usr/local/lib/site_ruby/1.9.1/rubygems.rb:185:intry_activate' /usr/local/lib/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:132:in rescue in require' /usr/local/lib/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:144:inrequire' /usr/local/heroku/vendor/gems/addressable-2.3.2/lib/addressable/idna/native.rb:19:in <top (required)>' /usr/local/lib/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:55:inrequire' /usr/local/lib/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:55:in require' /usr/local/heroku/vendor/gems/addressable-2.3.2/lib/addressable/idna.rb:20:in' /usr/local/lib/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:55:in require' /usr/local/lib/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:55:inrequire' /usr/local/heroku/vendor/gems/addressable-2.3.2/lib/addressable/uri.rb:20:in <top (required)>' /usr/local/lib/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:55:inrequire' /usr/local/lib/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:55:in require' /usr/local/heroku/vendor/gems/launchy-2.4.2/lib/launchy.rb:1:in' /usr/local/lib/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:55:in require' /usr/local/lib/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:55:inrequire' /usr/local/heroku/lib/heroku/helpers.rb:327:in block in launchy' /usr/local/heroku/lib/heroku/helpers.rb:227:inaction' /usr/local/heroku/lib/heroku/helpers.rb:326:in launchy' /usr/local/heroku/lib/heroku/command/addons.rb:179:inopen' /usr/local/heroku/lib/heroku/command.rb:218:in run' /usr/local/heroku/lib/heroku/cli.rb:37:instart' /usr/bin/heroku:25:in `'

Command:     heroku addons:open scheduler
Version:     heroku-toolbelt/3.9.0 (i686-linux) ruby/1.9.3