Raised by Resolver when a dependency requests a gem for which there is no spec.

Methods
N
Attributes
[R] dependency

The unsatisfiable dependency. This is a Gem::Resolver::DependencyRequest, not a Gem::Dependency
Class Public methods
new(dep, platform_mismatch=nil)

Creates a new UnsatisfiableDependencyError for the unsatisfiable Gem::Resolver::DependencyRequest dep

Source: show 

# File lib/rubygems/exceptions.rb, line 229
def initialize dep, platform_mismatch=nil
  if platform_mismatch and !platform_mismatch.empty?
    plats = platform_mismatch.map { |x| x.platform.to_s }.sort.uniq
    super "Unable to resolve dependency: No match for '#{dep}' on this platform. Found: #{plats.join(', ')}"
  else
    if dep.explicit?
      super "Unable to resolve dependency: user requested '#{dep}'"
    else
      super "Unable to resolve dependency: '#{dep.request_context}' requires '#{dep}'"
    end
  end

  @dependency = dep
end