Program: 89038
Project: 89038
Buggy source:
@Override public void onEnable(){
  informer=new ExperienceInformerListener();
  interactionListener=new PlayerInteractionListener();
  commandExperienceMod=new CommandExperienceMod(this);
  commandSpawn=new CommandSpawnExp(this);
  customProvider.setLastInteraction(interactionListener);
  if (hasEconomy()) {
    manager.registerEvents(itemListener,this);
  }
  try {
    loadDefaults(false);
    manager.registerEvents(interactionListener,this);
    manager.registerEvents(xpBlockListener,this);
    manager.registerEvents(xpItemListener,this);
    manager.registerEvents(xpMobListener,this);
    manager.registerEvents(xpEnchancer,this);
    manager.registerEvents(xpCleanup,this);
    manager.registerEvents(informer,this);
  }
 catch (  IOException e) {
    currentLogger.severe("String_Node_Str" + e.getMessage());
  }
  Permissions.setGlobakSettings(globalSettings);
  historyProviders.register(new MemoryService(globalSettings.getMaxBlocksInHistory(),globalSettings.getMaxAgeInHistory()));
  if (LogBlockService.exists(manager)) {
    if (!historyProviders.containsService(LogBlockService.NAME)) {
      historyProviders.register(LogBlockService.create(manager));
    }
    currentLogger.info("String_Node_Str");
  }
 else {
    currentLogger.info("String_Node_Str");
  }
  disableServices(historyProviders,globalSettings.getDisabledServices());
  disableServices(channelProvider,globalSettings.getDisabledServices());
  disableServices(rewardProvider,globalSettings.getDisabledServices());
  disableServices(customProvider,globalSettings.getDisabledServices());
  getCommand(commandReload).setExecutor(commandExperienceMod);
  getCommand(commandSpawnExp).setExecutor(commandSpawn);
  serverTickTask=getServer().getScheduler().scheduleSyncRepeatingTask(this,new Runnable(){
    public void run(){
      onServerTick();
    }
  }
,TICK_DELAY,TICK_DELAY);
  if (serverTickTask < 0)   printWarning(this,"String_Node_Str");
}

Fixed version (ground truth):
@Override public void onEnable(){
  informer=new ExperienceInformerListener();
  interactionListener=new PlayerInteractionListener();
  commandExperienceMod=new CommandExperienceMod(this);
  commandSpawn=new CommandSpawnExp(this);
  customProvider.setLastInteraction(interactionListener);
  if (hasEconomy()) {
    manager.registerEvents(itemListener,this);
  }
  try {
    loadDefaults(false);
    manager.registerEvents(interactionListener,this);
    manager.registerEvents(xpBlockListener,this);
    manager.registerEvents(xpItemListener,this);
    manager.registerEvents(xpMobListener,this);
    manager.registerEvents(xpEnchancer,this);
    manager.registerEvents(xpCleanup,this);
    manager.registerEvents(informer,this);
  }
 catch (  IOException e) {
    currentLogger.severe("String_Node_Str" + e.getMessage());
  }
  historyProviders.register(new MemoryService(globalSettings.getMaxBlocksInHistory(),globalSettings.getMaxAgeInHistory()));
  if (LogBlockService.exists(manager)) {
    if (!historyProviders.containsService(LogBlockService.NAME)) {
      historyProviders.register(LogBlockService.create(manager));
    }
    currentLogger.info("String_Node_Str");
  }
 else {
    currentLogger.info("String_Node_Str");
  }
  disableServices(historyProviders,globalSettings.getDisabledServices());
  disableServices(channelProvider,globalSettings.getDisabledServices());
  disableServices(rewardProvider,globalSettings.getDisabledServices());
  disableServices(customProvider,globalSettings.getDisabledServices());
  getCommand(commandReload).setExecutor(commandExperienceMod);
  getCommand(commandSpawnExp).setExecutor(commandSpawn);
  serverTickTask=getServer().getScheduler().scheduleSyncRepeatingTask(this,new Runnable(){
    public void run(){
      onServerTick();
    }
  }
,TICK_DELAY,TICK_DELAY);
  if (serverTickTask < 0)   printWarning(this,"String_Node_Str");
}