Error during parsing long XML attribute

Error during running it

 #<REXML::ParseException: Missing end tag for '' (got "script")
Line:
Position:
Last 80 unconsumed characters:
<script src="/ScriptResource.axd?d=7U-Er19kh_JjK1ubeNNVTSx9__awLZxWmG0GmOECsKCy77>
/usr/lib/ruby/1.8/rexml/parsers/baseparser.rb:330:in `pull'
/usr/lib/ruby/1.8/rexml/parsers/treeparser.rb:22:in `parse'
/usr/lib/ruby/1.8/rexml/document.rb:228:in `build'
/usr/lib/ruby/1.8/rexml/document.rb:43:in `initialize'
pizdets.rb:421:in `new'
pizdets.rb:421:in `parse_script_tag'
pizdets.rb:456:in `get_ciphertext_sample'
pizdets.rb:440:in `each'
pizdets.rb:440:in `get_ciphertext_sample'
pizdets.rb:605:in `run'
pizdets.rb:637
...
Missing end tag for '' (got "script")
Line:
Position:
Last 80 unconsumed characters:
<script src="/ScriptResource.axd?d=7U-Er19kh_JjK1ubeNNVTSx9__awLZxWmG0GmOECsKCy77
Line:
Position:
Last 80 unconsumed characters:
<script src="/ScriptResource.axd?d=7U-Er19kh_JjK1ubeNNVTSx9__awLZxWmG0GmOECsKCy77

Snippet from ruby script

# line 421 is doc = REXML::Document.new xml

 def parse_script_tag xml, re
    d = nil

    doc = REXML::Document.new xml
    doc.elements.each 'script' do |e|
      src_attribute = e.attributes['src']
      md = re.match src_attribute
      d = md[1]
      break
    end

    raise RuntimeError, "could not parse script_tag" unless d

    d
  end