incompatible character encodings: UTF-8 and ASCII-8BIT

gistfile1.txt

dima@me:~$ rvm gemset create rc1
'rc1' gemset created (/home/dima/.rvm/gems/ruby-1.9.2-p180@rc1).

dima@me:~$ rvm gemset use rc1
Now using gemset 'rc1'

dima@me:~$ gem update --system
Latest version currently installed. Aborting.

dima@me:~$ gem install rails --pre
Fetching: multi_json-1.0.3.gem (100%)
Fetching: activesupport-3.1.0.rc1.gem (100%)
Fetching: builder-3.0.0.gem (100%)
Fetching: i18n-0.6.0.gem (100%)
Fetching: bcrypt-ruby-2.1.4.gem (100%)
Building native extensions.  This could take a while...
Fetching: activemodel-3.1.0.rc1.gem (100%)
Fetching: rack-1.3.0.gem (100%)
Fetching: rack-cache-1.0.2.gem (100%)
Fetching: rack-test-0.6.0.gem (100%)
Fetching: rack-mount-0.8.1.gem (100%)
Fetching: hike-1.0.0.gem (100%)
Fetching: tilt-1.3.2.gem (100%)
Fetching: sprockets-2.0.0.beta.8.gem (100%)
Fetching: tzinfo-0.3.27.gem (100%)
Fetching: erubis-2.7.0.gem (100%)
Fetching: actionpack-3.1.0.rc1.gem (100%)
Fetching: arel-2.1.1.gem (100%)
Fetching: activerecord-3.1.0.rc1.gem (100%)
Fetching: activeresource-3.1.0.rc1.gem (100%)
Fetching: mime-types-1.16.gem (100%)
Fetching: polyglot-0.3.1.gem (100%)
Fetching: treetop-1.4.9.gem (100%)
Fetching: mail-2.3.0.gem (100%)
Fetching: actionmailer-3.1.0.rc1.gem (100%)
Fetching: thor-0.14.6.gem (100%)
Fetching: rack-ssl-1.3.2.gem (100%)
Fetching: railties-3.1.0.rc1.gem (100%)
Fetching: bundler-1.0.14.gem (100%)
Fetching: rails-3.1.0.rc1.gem (100%)
Successfully installed multi_json-1.0.3
Successfully installed activesupport-3.1.0.rc1
Successfully installed builder-3.0.0
Successfully installed i18n-0.6.0
Successfully installed bcrypt-ruby-2.1.4
Successfully installed activemodel-3.1.0.rc1
Successfully installed rack-1.3.0
Successfully installed rack-cache-1.0.2
Successfully installed rack-test-0.6.0
Successfully installed rack-mount-0.8.1
Successfully installed hike-1.0.0
Successfully installed tilt-1.3.2
Successfully installed sprockets-2.0.0.beta.8
Successfully installed tzinfo-0.3.27
Successfully installed erubis-2.7.0
Successfully installed actionpack-3.1.0.rc1
Successfully installed arel-2.1.1
Successfully installed activerecord-3.1.0.rc1
Successfully installed activeresource-3.1.0.rc1
Successfully installed mime-types-1.16
Successfully installed polyglot-0.3.1
Successfully installed treetop-1.4.9
Successfully installed mail-2.3.0
Successfully installed actionmailer-3.1.0.rc1
Successfully installed thor-0.14.6
Successfully installed rack-ssl-1.3.2
Successfully installed railties-3.1.0.rc1
Successfully installed bundler-1.0.14
Successfully installed rails-3.1.0.rc1
29 gems installed
Installing ri documentation for multi_json-1.0.3...
Installing ri documentation for activesupport-3.1.0.rc1...
Installing ri documentation for builder-3.0.0...
Installing ri documentation for i18n-0.6.0...
Installing ri documentation for bcrypt-ruby-2.1.4...
Installing ri documentation for activemodel-3.1.0.rc1...
Installing ri documentation for rack-1.3.0...
Installing ri documentation for rack-cache-1.0.2...
Installing ri documentation for rack-test-0.6.0...
Installing ri documentation for rack-mount-0.8.1...
Installing ri documentation for hike-1.0.0...
Installing ri documentation for tilt-1.3.2...
Installing ri documentation for sprockets-2.0.0.beta.8...
Installing ri documentation for tzinfo-0.3.27...
Installing ri documentation for erubis-2.7.0...
Installing ri documentation for actionpack-3.1.0.rc1...
Installing ri documentation for arel-2.1.1...
Installing ri documentation for activerecord-3.1.0.rc1...
Installing ri documentation for activeresource-3.1.0.rc1...
Installing ri documentation for mime-types-1.16...
Installing ri documentation for polyglot-0.3.1...
Installing ri documentation for treetop-1.4.9...
Installing ri documentation for mail-2.3.0...
Installing ri documentation for actionmailer-3.1.0.rc1...
Installing ri documentation for thor-0.14.6...
Installing ri documentation for rack-ssl-1.3.2...
Installing ri documentation for railties-3.1.0.rc1...
Installing ri documentation for bundler-1.0.14...
Installing ri documentation for rails-3.1.0.rc1...
Installing RDoc documentation for multi_json-1.0.3...
Installing RDoc documentation for activesupport-3.1.0.rc1...
ERROR:  While generating documentation for activesupport-3.1.0.rc1
... MESSAGE:   incompatible character encodings: UTF-8 and ASCII-8BIT
... RDOC args: --op /home/dima/.rvm/gems/ruby-1.9.2-p180@rc1/doc/activesupport-3.1.0.rc1/rdoc lib --title activesupport-3.1.0.rc1 Documentation --quiet



dima@me:~$ gem environment
RubyGems Environment:
  - RUBYGEMS VERSION: 1.8.4
  - RUBY VERSION: 1.9.2 (2011-02-18 patchlevel 180) [x86_64-linux]
  - INSTALLATION DIRECTORY: /home/dima/.rvm/gems/ruby-1.9.2-p180@rc1
  - RUBY EXECUTABLE: /home/dima/.rvm/rubies/ruby-1.9.2-p180/bin/ruby
  - EXECUTABLE DIRECTORY: /home/dima/.rvm/gems/ruby-1.9.2-p180@rc1/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-linux
  - GEM PATHS:
     - /home/dima/.rvm/gems/ruby-1.9.2-p180@rc1
     - /home/dima/.rvm/gems/ruby-1.9.2-p180@global
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
     - :sources => ["http://gems.rubyforge.org/", "http://gemcutter.org/"]
  - REMOTE SOURCES:
     - http://gems.rubyforge.org/
     - http://gemcutter.org/