error installing engineyard-dns

I tried

gem install engineyard-dns

and got the following error:

ERROR: While executing gem … (NoMethodError)
undefined method `call’ for nil:NilClass

what Im doing wrong?

I tried

gem install engineyard-dns

and got the following error:

ERROR: While executing gem … (NoMethodError)

undefined method `call' for nil:NilClass

what Im doing wrong?

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I suspect this is a problem with your rubygems version, possibly a
conflict with the version of ruby you are using. Tell us about your
operating system and how you have installed stuff.

Which version of ruby and rubygems are you using?

Colin