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Raised by the DependencyInstaller when a specific gem cannot be found
Creates a new SpecificGemNotFoundException for a gem with the given name and version.  Any errors encountered when attempting to find the gem are also stored.
 
               # File rubygems/exceptions.rb, line 95
def initialize(name, version, errors=nil)
  super "Could not find a valid gem '#{name}' (#{version}) locally or in a repository"
  @name = name
  @version = version
  @errors = errors
end