Install substruct ROR - Errors!!

[guinnessmerda]

Hi all, I'm trying to install substruct on my local server on mac os x snow leopard.

I create the database on mysql, update all gems, update rails...but when I try to rake db:create I receive:

MacBook-Pro-di-Orazio:substruct_rel_1-3-1 Orazio$ rake db:create --trace

rake aborted!

uninitialized constant ActiveSupport::Dependencies::Mutex

/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/ext/module.rb:36:in `const_missing'

/Users/Orazio/Desktop/substruct_rel_1-3-1/vendor/rails/activesupport/lib/active_support/dependencies.rb:55

/Library/Ruby/Site/1.8/rubygems/custom_require.rb:36:in `gem_original_require'

/Library/Ruby/Site/1.8/rubygems/custom_require.rb:36:in `require'

/Users/Orazio/Desktop/substruct_rel_1-3-1/vendor/rails/activesupport/lib/active_support.rb:57

/Library/Ruby/Site/1.8/rubygems/custom_require.rb:36:in `gem_original_require'

/Library/Ruby/Site/1.8/rubygems/custom_require.rb:36:in `require'

/Users/Orazio/Desktop/substruct_rel_1-3-1/vendor/rails/railties/lib/tasks/misc.rake:18

/Users/Orazio/Desktop/substruct_rel_1-3-1/vendor/rails/railties/lib/tasks/rails.rb:4:in `load'

/Users/Orazio/Desktop/substruct_rel_1-3-1/vendor/rails/railties/lib/tasks/rails.rb:4

/Users/Orazio/Desktop/substruct_rel_1-3-1/vendor/rails/railties/lib/tasks/rails.rb:4:in `each'

/Users/Orazio/Desktop/substruct_rel_1-3-1/vendor/rails/railties/lib/tasks/rails.rb:4

/Library/Ruby/Site/1.8/rubygems/custom_require.rb:36:in `gem_original_require'

/Library/Ruby/Site/1.8/rubygems/custom_require.rb:36:in `require'

/Users/Orazio/Desktop/substruct_rel_1-3-1/Rakefile:12

/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/rake_module.rb:25:in `load'

/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/rake_module.rb:25:in `load_rakefile'

/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:495:in `raw_load_rakefile'

/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:78:in `load_rakefile'

/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'

/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:77:in `load_rakefile'

/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:61:in `run'

/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'

/Library/Ruby/Gems/1.8/gems/rake-0.9.2/lib/rake/application.rb:59:in `run'

/Library/Ruby/Gems/1.8/gems/rake-0.9.2/bin/rake:32

/usr/bin/rake:19:in `load'

/usr/bin/rake:19

MacBook-Pro-di-Orazio:substruct_rel_1-3-1 Orazio$ 

Could anyone help me please?

Thank you so much!