ruby on rails 3 - Error on db:migrate -

ruby on rails 3 - Error on db:migrate -

i trying modify rails app built on computer ,i ran bundle install , gems got installed.but when run rake db:migrate ,it throws downwards bunch of errors ,i new rail , cant understand error messages

rake aborted! /home/diadara/.rvm/gems/ruby-1.9.3-p374@saasrails3.1/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.so: undefined symbol: ruby_current_thread - /home/diadara/.rvm/gems/ruby-1.9.3-p374@saasrails3.1/gems/ruby-debug-base19-0.11.25/lib/ruby_debug.so /home/diadara/.rvm/gems/ruby-1.9.3-p374@saasrails3.1/gems/ruby-debug-base19-0.11.25/lib/ruby-debug-base.rb:1:in `require' /home/diadara/.rvm/gems/ruby-1.9.3-p374@saasrails3.1/gems/ruby-debug-base19-0.11.25/lib/ruby-debug-base.rb:1:in `<top (required)>' /home/diadara/.rvm/gems/ruby-1.9.3-p374@saasrails3.1/gems/ruby-debug19-0.11.6/cli/ruby-debug.rb:5:in `require' /home/diadara/.rvm/gems/ruby-1.9.3-p374@saasrails3.1/gems/ruby-debug19-0.11.6/cli/ruby-debug.rb:5:in `<top (required)>' /home/diadara/.rvm/gems/ruby-1.9.3-p374@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:68:in `require' /home/diadara/.rvm/gems/ruby-1.9.3-p374@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:68:in `block (2 levels) in require' /home/diadara/.rvm/gems/ruby-1.9.3-p374@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:66:in `each' /home/diadara/.rvm/gems/ruby-1.9.3-p374@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:66:in `block in require' /home/diadara/.rvm/gems/ruby-1.9.3-p374@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:55:in `each' /home/diadara/.rvm/gems/ruby-1.9.3-p374@global/gems/bundler-1.2.3/lib/bundler/runtime.rb:55:in `require' /home/diadara/.rvm/gems/ruby-1.9.3-p374@global/gems/bundler-1.2.3/lib/bundler.rb:128:in `require' /home/diadara/hw3_rottenpotatoes/config/application.rb:13:in `<top (required)>' /home/diadara/hw3_rottenpotatoes/rakefile:5:in `require' /home/diadara/hw3_rottenpotatoes/rakefile:5:in `<top (required)>' /home/diadara/.rvm/gems/ruby-1.9.3-p374@saasrails3.1/gems/rake-0.9.2.2/lib/rake/rake_module.rb:25:in `load' /home/diadara/.rvm/gems/ruby-1.9.3-p374@saasrails3.1/gems/rake-0.9.2.2/lib/rake/rake_module.rb:25:in `load_rakefile' /home/diadara/.rvm/gems/ruby-1.9.3-p374@saasrails3.1/gems/rake-0.9.2.2/lib/rake/application.rb:501:in `raw_load_rakefile' /home/diadara/.rvm/gems/ruby-1.9.3-p374@saasrails3.1/gems/rake-0.9.2.2/lib/rake/application.rb:82:in `block in load_rakefile' /home/diadara/.rvm/gems/ruby-1.9.3-p374@saasrails3.1/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling' /home/diadara/.rvm/gems/ruby-1.9.3-p374@saasrails3.1/gems/rake-0.9.2.2/lib/rake/application.rb:81:in `load_rakefile' /home/diadara/.rvm/gems/ruby-1.9.3-p374@saasrails3.1/gems/rake-0.9.2.2/lib/rake/application.rb:65:in `block in run' /home/diadara/.rvm/gems/ruby-1.9.3-p374@saasrails3.1/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling' /home/diadara/.rvm/gems/ruby-1.9.3-p374@saasrails3.1/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run' /home/diadara/.rvm/gems/ruby-1.9.3-p374@saasrails3.1/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>' /home/diadara/.rvm/gems/ruby-1.9.3-p374@saasrails3.1/bin/rake:19:in `<main>' /home/diadara/.rvm/gems/ruby-1.9.3-p374@saasrails3.1/bin/ruby_noexec_wrapper:14:in `eval' /home/diadara/.rvm/gems/ruby-1.9.3-p374@saasrails3.1/bin/ruby_noexec_wrapper:14:in `<main>'

it looks did not install ruby-debug in project. remove gemfile if not needed or have @ reply prepare it: cannot utilize ruby-debug19 1.9.3-p0?

ruby-on-rails-3