a rake file which is failing

bad.rake

namespace :smeagol do
  desc "Synchronize change_set_revisions with svn"
  task :sync_svn_revisions => :environment do |t, args|

    message :title, "In the beginning... gathering current revisions"
      Branch.all.each do |b|
        message :info, "Visiting branch #{b.name}"
        message :plain, "  running svn log for #{b.svn_url}..."
        # this is failing at the sed
        @revs_str = %x(svn log "#{b.svn_url}" | tr -d '\n' | sed -r 's/-{2,}/\n/g' | sed -r 's/ \([^\)]+\)//g' | sed -r 's/^r//' | sed -r "s/[0-9]+ lines?//g" | sort -g)
        @revs = @revs_str.split("\n")
        message :plain, "  finished svn log for #{b.svn_url} - #{@revs.size} revisions found"
      end

error.rb

Visiting branch CERT4


  running svn log for http://tcysvn02.dev.sabre.com/tvly/tvl-puppet/tvl/puppet/CERT4/...

sed: -e expression #1, char 8: unterminated `s' command
svn: Write error: Broken pipe