create_tags error

Error

I, [2011-01-21T10:55:16.783488 #11240]  INFO -- : New RightAws::Ec2 using shared connections mode
I, [2011-01-21T10:55:16.784474 #11240]  INFO -- : Opening new HTTPS connection to eu-west-1.ec2.amazonaws.com:443
-> i-d09985a7  ec2-46-137-17-195.eu-west-1.compute.amazonaws.com
W, [2011-01-21T10:55:19.213078 #11240]  WARN -- : ##### RightAws::Ec2 returned an error: 400 Bad Request
<?xml version="1.0" encoding="UTF-8"?>
<Response><Errors><Error><Code>InvalidParameterCombination</Code><Message>The parameter 'Value' may only be specified once.</Message></Error></Errors><RequestID>d6d4fddb-279b-48b3-beb3-4c3a574b60b7</RequestID></Response> #####
W, [2011-01-21T10:55:19.213232 #11240]  WARN -- : ##### RightAws::Ec2 request: https://eu-west-1.ec2.amazonaws.com:443/?AWSAccessKeyId=XXXXXXXXXXXXXXXXXXXXX&Action=CreateTags&ResourceId.1=i-12345678&SignatureMethod=HmacSHA256&SignatureVersion=2&Tag.1.Key.1=myKey1&Tag.1.Key.2=myValue1&Tag.1.Value.1=myKey2&Tag.1.Value.2=myValue2&Timestamp=2011-01-21T09%3A55%3A17.000Z&Version=2010-08-31&Signature=XXXXXXXXXXXXXXXXXXXXXXXXXXX ####
/usr/local/Cellar/ruby/1.9.2-p136/lib/ruby/gems/1.9.1/gems/right_aws-2.1.0/lib/awsbase/right_awsbase.rb:545:in `request_info_impl': InvalidParameterCombination: The parameter 'Value' may only be specified once. (RightAws::AwsError)
	from /usr/local/Cellar/ruby/1.9.2-p136/lib/ruby/gems/1.9.1/gems/right_aws-2.1.0/lib/ec2/right_ec2.rb:140:in `request_info'
	from /usr/local/Cellar/ruby/1.9.2-p136/lib/ruby/gems/1.9.1/gems/right_aws-2.1.0/lib/ec2/right_ec2_tags.rb:79:in `create_tags'
	from test_right_aws.rb:13:in `block in <main>'
	from test_right_aws.rb:11:in `each'
	from test_right_aws.rb:11:in `<main>'

Sample code

require 'rubygems'
require 'right_aws'

key = "XXXXXXXXXXXXXXXXX"
secret = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
endpoint = "https://eu-west-1.ec2.amazonaws.com/"

ec2 = RightAws::Ec2.new(key, secret, :endpoint_url => endpoint )

ec2.describe_instances.each do |instance|
	puts "-> #{instance[:aws_instance_id]}  #{instance[:dns_name]}" 	
	ec2.create_tags(instance[:aws_instance_id], [{"myKey1" => "myValue1", "myKey2" => "myValue2"}])
	ec2.describe_tags(:filters => { 'resource-id' => instance[:aws_instance_id]}).each do |tag|
		puts "#{tag[:key]} -- #{tag[:value]}"
	end
end