Sorry guys, I am new at RoR and have the above error as I try to run 
rake db:migrate. Could anyone help.

With --trace I get

 rake db:migrate --trace
rake aborted!
undefined method `task' for #<Harpers::Application:0x9277438>
/home/student/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.7/lib/rails/application.rb:215:in
 
`initialize_tasks'
/home/student/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.7/lib/rails/application.rb:139:in
 
`load_tasks'
/home/student/.rvm/gems/ruby-1.9.2-p0/gems/railties-3.0.7/lib/rails/application.rb:77:in
 
`method_missing'
/home/student/home/harpers/Rakefile:7:in `<top (required)>'
/home/student/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.9.0/lib/rake/rake_module.rb:25:in
 
`load'
/home/student/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.9.0/lib/rake/rake_module.rb:25:in
 
`load_rakefile'
/home/student/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.9.0/lib/rake/application.rb:495:in
 
`raw_load_rakefile'
/home/student/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.9.0/lib/rake/application.rb:78:in
 
`block in load_rakefile'
/home/student/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.9.0/lib/rake/application.rb:129:in
 
`standard_exception_handling'
/home/student/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.9.0/lib/rake/application.rb:77:in
 
`load_rakefile'
/home/student/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.9.0/lib/rake/application.rb:61:in
 
`block in run'
/home/student/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.9.0/lib/rake/application.rb:129:in
 
`standard_exception_handling'
/home/student/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.9.0/lib/rake/application.rb:59:in
 
`run'
/home/student/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.9.0/bin/rake:31:in 
`<top (required)>'
/home/student/.rvm/gems/ruby-1.9.2-p0/bin/rake:19:in `load'
/home/student/.rvm/gems/ruby-1.9.2-p0/bin/rake:19:in `<main>'

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