OpenNebula

        tags = generate_options(:tags, ec2_info) || {}
        tags['ONE_ID'] = id
        tags.each{ |key,value|
            begin
                instance.add_tag(key, :value => value)
            rescue => e
                STDERR.puts(e.message)
                exit(-1)
            end
        }

The "-t" key should be removed from the tags hash