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gmd install rails error

when i go through installing the gems i get an error when i type into cmd prompt

"gem install rails"

it says:

ERROR: While executing gems .. (NoMethodError) undefined method size for nil:NilClass

3 Answers

i did a gem update rdoc and overwrited the existing files and when i did the gem install rails command again. it says the same thing

online it says it should be disregarded as it should say a "#" of gems installed, but mine goes straight to the error message written above

i used the gem install rails -v=1.2.3 and it gave me 6 gems installed. i dont know if thats all i need to do which makes it complete or not