Ruby on Rails

I am working with Agile Web Development Book. I create complete app but
when I am trying to test my first unit testing. Its showing following
error.


1) Error:
test_truth(ProductTest):
Errno::ENOENT: No such file or directory - rails.png
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/fixtures.rb:814:in `readlines'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/fixtures.rb:814:in `read_fixture_file'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/fixtures.rb:768:in `initialize'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/fixtures.rb:712:in `new'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/fixtures.rb:712:in `read_yaml_fixture_files'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/fixtures.rb:707:in `each'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/fixtures.rb:707:in `read_yaml_fixture_files'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/fixtures.rb:706:in `each'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/fixtures.rb:706:in `read_yaml_fixture_files'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/fixtures.rb:676:in `read_fixture_files'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/fixtures.rb:549:in `initialize'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/fixtures.rb:509:in `new'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/fixtures.rb:509:in `create_fixtures'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/fixtures.rb:508:in `map'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/fixtures.rb:508:in `create_fixtures'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/connection_adapters/mysql_adapter.rb:234:in
`disable_referential
_integrity'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/fixtures.rb:505:in `create_fixtures'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/base.rb:1198:in `silence'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/fixtures.rb:504:in `create_fixtures'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/fixtures.rb:1000:in `load_fixtures'
C:/Users/Amir/Downloads/IR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/li
b/active_record/fixtures.rb:934:in `setup'

1 tests, 0 assertions, 0 failures, 1 errors

Please help me out. Your inputs and suggestions are welcome.

Thanks
Amir

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