Gems error

Why error is happen?

ruby -e “require ‘rubyclr’”
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:123:in
alias_const_missing': uninitialized constant IDataErrorInfo (NameError) from C:/rubyclr/Src/Ruby/core.rb:258:inconst_missing’
from
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:133:in
send' from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:133:inconst_missing’
from C:/rubyclr/Src/Ruby/databinding.rb:30
from
c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
gem_original_require' from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:inrequire’
from
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
require' from C:/rubyclr/Src/Ruby/rubyclr.rb:21 from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:ingem_original_require’
from
c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require’
from -e:1

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