Since a week ago I used this crawler to have the co-author list of DBLP authors, it worked fine, but it stopped, i don't know where is the problem, because it doesn't shows any error but just doesn't crawls (have a empty file of results) maybe it is the problem on the DBLP page itself. here are the files I've used. Please help to make function this file again because I need to finish a project. please help 
 
#!/usr/bin/perl

# This script scrapes co-author info for a specific person from DBLP.
# Revision 1 intended use is to supply author name on cmd line,
#   with a list of co-authors provided as output, one per line.
# Revision 2 methodizes the crawler to provide multi-lvl crawling.
# Revision 3 encapsulates the crawler in a loop to run against a list 
+of authors.
# Status output is written to STDOUT, errors (such as unfound authors)
+ written
#   to STDERR, and coauthor info is written to the file specified belo
+w.

# Import Perl's WWW library for quick & easy web retrieval.
#    utf8 allows unicode char in this script, and also import HTML uni
+code conversion methods.
use utf8;
use LWP::Simple;
use HTML::Entities;


# Inits; $sleep indicates time to wait between each author crawl.
my %conflicts = ();
my %index = ();
my $base_url  = 'http://www.informatik.uni-trier.de/~ley/db/indices/a-
+tree/';
my $sleep     = 0;
my $outfile   = 'conf.txt.';
my $index_number = 0;
my $index_dy = 0;

# DBLP full names for some authors otherwise not found in catalog.
my %fullnames = ('List of names snipped');

# Open the input data, parsing out reviewer names into a list.  Init o
+utput file.
$filename = "author.txt";
open(INPUT,$filename) or die "Can't open file $filename\n";
undef $/; my $text=<INPUT>; close INPUT; $/ = "\n";     
@reviewers = split(/\n/, $text);
my $num_reviewers = $#reviewers + 1;

# Open output file...  use > to start over, >> to continue.
open OUTFILE, '>>'.$outfile;
close OUTFILE;

# Disable buffering on STDOUT so I can see the damn progress log in re
+altime.
select((select(STDOUT), $|=1)[0]);

# Loop over all reviewers, formatting name and calling the Crawler.
my $count = 0;

foreach my $reviewer (@reviewers)
{
  # Loop inits; clear the conflicts hash.
  $count++; $index_number++; $index_dy++;
  next if ($count < 0); # Skip to current guy (or gal).
   %conflicts = ();
   print 'Working on ', $reviewer, ', # ', $count, ' of ', $num_review
+ers, '...  ';
# Format reviewer name to match DBLP specs.
   my $orig_name = $reviewer;
   $reviewer = encode_entities($reviewer);
   $reviewer =~ s/[^\w\s]/=/g;

   my ($first, $middle, $last) = split /\s+/, $reviewer;
   my $formatted = '';
   if (defined $last)
   {  $formatted = $last.':'.$first.'_'.$middle;  }
   else
   {  $formatted = $middle.':'.$first;  }
   $index{$formatted} = $index_dy;
   $index{$conflicts} = $index_number;
   # Call the crawler method with formatted name.
   #&Crawl('Fox:Edward_A=');
&Crawl($formatted);



  # Output the results.
  open OUTFILE, '>>'.$outfile;
    
  foreach my $key (keys %conflicts)
  {  print OUTFILE $index{$formatted}, '=', $orig_name,'=', $conflicts
+{$key},' ', "\n";  }
    
  my @conflicts = sort keys %conflicts;
  #$index{$formatted}
 
#$index{$conflicts},
%conflicts = ();
  foreach my $conflict (@conflicts)
  {   &Crawl($conflict);
      ($surname, $name) = split /:/,$conflict;
      open OUTFILE, '>>'.$outfile;
  
      
  }
  close OUTFILE;

  # Finished with this $reviewer, wait $sleep seconds before starting 
+next.
  print 'done.', "\n";
  sleep $sleep;
}






# Returns a list of co-authors from DBLP.
sub Crawl
{ 
  # Compose author name for retrieval.
  my $name    = shift || die "Bad usage of method Crawl.";
    #print "\n",$name,"\n";
  my $category = lc(substr($name, 0, 1));
    #print "\n",$category ,"\n";

  # Construct author URL and retrieve summary page.
  my $url      = $base_url.$category.'/'.$name.'.html';
    #print "\n",$url ,"\n";
  my $page     = get($url) || warn "Couldn't get ${url}: $!";
    #print "\n",$page ,"\n";
  return () unless defined $page;
  # Find co-authors list at bottom and parse out all names & URLs.
  while ($page =~ m{<\/td>    # First two lines match style code.
                  <td\sclass="coauthor"\salign="right"\sbgcolor="[^"]+
+">
                  <a\shref="([^"]+)">            # Matches relative li
+nk to coauthor page.
                 ([^>]+)<\/a>                      # Matches co-author
+ name.
                }mgx)
  {  # Translate relative URL into an absolute using base address of D
+BLP.
     my $url         = $1;
     my $coauth_name = $2;
     my ($tmp1, $tmp2, $tmp3) = split '/', $url;
     my $coauth = $tmp3;
     $coauth =~ s/.html$//;
     $coauth_name = decode_entities($coauth_name);
     # Save this co-author.
     $conflicts{$coauth} = $coauth_name;
     if (!exists $index{$coauth})
     {
         $index_number++;
         $index{$coauth} = $index_number;
     }
  }
  return 0;
}

[download]
the author file author.txt 
James F. Blakesley
James F. Blinn
James F. Blowey
James F. Bowring

[download]

In reply to fix the problem of the web crawler by ati

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