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use DocumentInfo;
my $doc_info = DocumentInfo::new('919');
my $last_accessed = $doc_info->getLastAccessed();

use DocumentInfo;
...
...
  my $file_id = shift; # suspect problem here
  return DocumentInfo::new($file_id);
}

use DocumentManager;
my $doc_mgr = DocumentManager::new();
my $doc_info = $doc_mgr->getDocumentInfo('919');