error at new rails app creation

In cmd prompt, I just tried to new rails app using, ~/documents>rails new app_name It throws an error as, Gem::InstallError: The 'json' native gem requires installed build tools.

In cmd prompt, I just tried to new rails app using, ~/documents>rails new app_name It throws an error as, Gem::InstallError: The 'json' native gem requires installed build tools.

You have some build tools missing. Without knowing which OS you are using and how you installed ruby and rails it is difficult to say more. I recommend using rvm for installing ruby and rails. rbenv may be a good alternative but I have no experience of that.

Colin

I've Windows7, Ruby 1.9.3 and Rails 3.2.6

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I've Windows7, Ruby 1.9.3 and Rails 3.2.6

In that case my advice is don't bother. Switch to a linux distribution such as Ubuntu, or use a Mac. In the long run life will be much simpler. You can dual boot ubuntu or use a VM. However I believe some have had success developing in windows so someone else may be able to help.

Colin