    # File lib/chef/resource.rb, line 91
          def fix_notifier_reference(resource_collection)
            matching_notifier = resource_collection.find(notifying_resource)
            if Array(matching_notifier).size > 1
              msg = "Notification #{self} from #{notifying_resource} was created with a reference to multiple notifying "\
              "resources, but can only originate from one resource.  Destination resource was defined "\
              "on #{resource.source_line}"
              raise Chef::Exceptions::InvalidResourceReference, msg
            end
            self.notifying_resource = matching_notifier

          rescue Chef::Exceptions::ResourceNotFound => e
            err = Chef::Exceptions::ResourceNotFound.new("Resource \#{resource} is configured to receive notifications from \#{notifying_resource} with action \#{action}, \\\nbut \#{notifying_resource} cannot be found in the resource collection. \#{resource} is defined in \\\n\#{resource.source_line}\n")
            err.set_backtrace(e.backtrace)
            raise err
          rescue Chef::Exceptions::InvalidResourceSpecification => e
              err = Chef::Exceptions::InvalidResourceSpecification.new("Resource \#{resource} is configured to receive notifications from  \#{notifying_resource} with action \#{action}, \\\nbut \#{notifying_resource.inspect} is not valid syntax to look up a resource in the resource collection. Notification \\\nis defined near \#{resource.source_line}\n")
              err.set_backtrace(e.backtrace)
            raise err
          end