Program: 98256
Project: 98256
Buggy source:
@SuppressWarnings("String_Node_Str") private void loadWorldConfiguration(){
  worldConfigFile=new File(world.getWorldFolder(),"String_Node_Str");
  worldConfig=YamlConfiguration.loadConfiguration(worldConfigFile);
  InputStream defConfigStream=AutoReferee.getInstance().getResource("String_Node_Str");
  if (defConfigStream != null)   worldConfig.setDefaults(YamlConfiguration.loadConfiguration(defConfigStream));
  worldConfig.options().copyDefaults(true);
  worldConfig.options().header(AutoReferee.getInstance().getDescription().getFullName());
  worldConfig.options().copyHeader(false);
  teams=Sets.newHashSet();
  messageReferees("String_Node_Str",getWorld().getName(),"String_Node_Str");
  for (  Map<?,?> map : worldConfig.getMapList("String_Node_Str"))   teams.add(AutoRefTeam.fromMap((Map<String,Object>)map,this));
  startMechanisms=Sets.newHashSet();
  for (  String sm : worldConfig.getStringList("String_Node_Str"))   startMechanisms.add(StartMechanism.unserialize(world,sm));
  protectedEntities=Sets.newHashSet();
  for (  String uid : worldConfig.getStringList("String_Node_Str"))   protectedEntities.add(UUID.fromString(uid));
  prohibitCraft=Sets.newHashSet();
  for (  String b : worldConfig.getStringList("String_Node_Str"))   prohibitCraft.add(BlockData.fromString(b));
  Set<UUID> uuidSearch=Sets.newHashSet(protectedEntities);
  for (  Entity e : getWorld().getEntities())   uuidSearch.remove(e.getUniqueId());
  if (!uuidSearch.isEmpty())   this.broadcast(ChatColor.RED + "String_Node_Str" + ChatColor.BOLD+ "String_Node_Str"+ ChatColor.RESET+ "String_Node_Str");
  if (worldConfig.isString("String_Node_Str"))   startRegion=CuboidRegion.fromCoords(worldConfig.getString("String_Node_Str"));
  if (worldConfig.isString("String_Node_Str"))   startTime=AutoReferee.parseTimeString(worldConfig.getString("String_Node_Str"));
  mapName=worldConfig.getString("String_Node_Str","String_Node_Str");
  versionString=worldConfig.getString("String_Node_Str","String_Node_Str");
  mapAuthors=worldConfig.getStringList("String_Node_Str");
  allowFriendlyFire=worldConfig.getBoolean("String_Node_Str",false);
  allowCraft=worldConfig.getBoolean("String_Node_Str",false);
  String dstr=worldConfig.getString("String_Node_Str","String_Node_Str");
  Difficulty diff=Difficulty.valueOf(dstr.toUpperCase());
  try {
    diff=Difficulty.getByValue(Integer.parseInt(dstr));
  }
 catch (  NumberFormatException e) {
  }
  world.setDifficulty(diff);
}

Fixed version (ground truth):
@SuppressWarnings("String_Node_Str") private void loadWorldConfiguration(){
  worldConfigFile=new File(world.getWorldFolder(),"String_Node_Str");
  worldConfig=YamlConfiguration.loadConfiguration(worldConfigFile);
  InputStream defConfigStream=AutoReferee.getInstance().getResource("String_Node_Str");
  if (defConfigStream != null)   worldConfig.setDefaults(YamlConfiguration.loadConfiguration(defConfigStream));
  worldConfig.options().copyDefaults(true);
  worldConfig.options().header(AutoReferee.getInstance().getDescription().getFullName());
  worldConfig.options().copyHeader(false);
  teams=Sets.newHashSet();
  messageReferees("String_Node_Str",getWorld().getName(),"String_Node_Str");
  setCurrentState(MatchStatus.WAITING);
  for (  Map<?,?> map : worldConfig.getMapList("String_Node_Str"))   teams.add(AutoRefTeam.fromMap((Map<String,Object>)map,this));
  startMechanisms=Sets.newHashSet();
  for (  String sm : worldConfig.getStringList("String_Node_Str"))   startMechanisms.add(StartMechanism.unserialize(world,sm));
  protectedEntities=Sets.newHashSet();
  for (  String uid : worldConfig.getStringList("String_Node_Str"))   protectedEntities.add(UUID.fromString(uid));
  prohibitCraft=Sets.newHashSet();
  for (  String b : worldConfig.getStringList("String_Node_Str"))   prohibitCraft.add(BlockData.fromString(b));
  Set<UUID> uuidSearch=Sets.newHashSet(protectedEntities);
  for (  Entity e : getWorld().getEntities())   uuidSearch.remove(e.getUniqueId());
  if (!uuidSearch.isEmpty())   this.broadcast(ChatColor.RED + "String_Node_Str" + ChatColor.BOLD+ "String_Node_Str"+ ChatColor.RESET+ "String_Node_Str");
  if (worldConfig.isString("String_Node_Str"))   startRegion=CuboidRegion.fromCoords(worldConfig.getString("String_Node_Str"));
  if (worldConfig.isString("String_Node_Str"))   startTime=AutoReferee.parseTimeString(worldConfig.getString("String_Node_Str"));
  mapName=worldConfig.getString("String_Node_Str","String_Node_Str");
  versionString=worldConfig.getString("String_Node_Str","String_Node_Str");
  mapAuthors=worldConfig.getStringList("String_Node_Str");
  allowFriendlyFire=worldConfig.getBoolean("String_Node_Str",false);
  allowCraft=worldConfig.getBoolean("String_Node_Str",false);
  String dstr=worldConfig.getString("String_Node_Str","String_Node_Str");
  Difficulty diff=Difficulty.valueOf(dstr.toUpperCase());
  try {
    diff=Difficulty.getByValue(Integer.parseInt(dstr));
  }
 catch (  NumberFormatException e) {
  }
  world.setDifficulty(diff);
}