Program: 133962
Project: 133962
Buggy source:
/** 
 * Scans all of the Jar files inside of /ProjectKorra/folder and registers all of the CoreAbility class files that were found.
 * @param folder the name of the folder to scan
 * @see #getAbilities()
 * @see #getAbility(String)
 */
public static void registerAddonAbilities(String folder){
  ProjectKorra plugin=ProjectKorra.plugin;
  File path=new File(plugin.getDataFolder().toString() + folder);
  if (!path.exists()) {
    return;
  }
  AbilityLoader<CoreAbility> abilityLoader=new AbilityLoader<CoreAbility>(plugin,path);
  List<CoreAbility> loadedAbilities=abilityLoader.load(CoreAbility.class,CoreAbility.class);
  for (  CoreAbility coreAbil : loadedAbilities) {
    if (!(coreAbil instanceof AddonAbility)) {
      plugin.getLogger().warning(coreAbil.getName() + "String_Node_Str");
      continue;
    }
 else     if (!coreAbil.isEnabled()) {
      plugin.getLogger().info(coreAbil.getName() + "String_Node_Str");
      continue;
    }
    AddonAbility addon=(AddonAbility)coreAbil;
    String name=coreAbil.getName();
    try {
      addon.load();
      ABILITIES_BY_NAME.put(name.toLowerCase(),coreAbil);
      if (coreAbil instanceof ComboAbility) {
        ComboAbility combo=(ComboAbility)coreAbil;
        if (combo.getCombination() != null) {
          ComboManager.getComboAbilities().put(name,new ComboManager.ComboAbilityInfo(name,combo.getCombination(),combo));
          ComboManager.getDescriptions().put(name,coreAbil.getDescription());
          ComboManager.getInstructions().put(name,combo.getInstructions());
          ComboManager.getAuthors().put(name,addon.getAuthor());
        }
      }
      if (coreAbil instanceof MultiAbility) {
        MultiAbility multiAbil=(MultiAbility)coreAbil;
        MultiAbilityManager.multiAbilityList.add(new MultiAbilityInfo(name,multiAbil.getMultiAbilities()));
      }
    }
 catch (    Exception|Error e) {
      plugin.getLogger().warning("String_Node_Str" + coreAbil.getName() + "String_Node_Str");
      e.printStackTrace();
      addon.stop();
      ABILITIES_BY_NAME.remove(coreAbil.getName(),coreAbil);
    }
  }
}

Fixed version (ground truth):
/** 
 * Scans all of the Jar files inside of /ProjectKorra/folder and registers all of the CoreAbility class files that were found.
 * @param folder the name of the folder to scan
 * @see #getAbilities()
 * @see #getAbility(String)
 */
public static void registerAddonAbilities(String folder){
  ProjectKorra plugin=ProjectKorra.plugin;
  File path=new File(plugin.getDataFolder().toString() + folder);
  if (!path.exists()) {
    path.mkdir();
    return;
  }
  AbilityLoader<CoreAbility> abilityLoader=new AbilityLoader<CoreAbility>(plugin,path);
  List<CoreAbility> loadedAbilities=abilityLoader.load(CoreAbility.class,CoreAbility.class);
  for (  CoreAbility coreAbil : loadedAbilities) {
    if (!(coreAbil instanceof AddonAbility)) {
      plugin.getLogger().warning(coreAbil.getName() + "String_Node_Str");
      continue;
    }
 else     if (!coreAbil.isEnabled()) {
      plugin.getLogger().info(coreAbil.getName() + "String_Node_Str");
      continue;
    }
    AddonAbility addon=(AddonAbility)coreAbil;
    String name=coreAbil.getName();
    try {
      addon.load();
      ABILITIES_BY_NAME.put(name.toLowerCase(),coreAbil);
      if (coreAbil instanceof ComboAbility) {
        ComboAbility combo=(ComboAbility)coreAbil;
        if (combo.getCombination() != null) {
          ComboManager.getComboAbilities().put(name,new ComboManager.ComboAbilityInfo(name,combo.getCombination(),combo));
          ComboManager.getDescriptions().put(name,coreAbil.getDescription());
          ComboManager.getInstructions().put(name,combo.getInstructions());
          ComboManager.getAuthors().put(name,addon.getAuthor());
        }
      }
      if (coreAbil instanceof MultiAbility) {
        MultiAbility multiAbil=(MultiAbility)coreAbil;
        MultiAbilityManager.multiAbilityList.add(new MultiAbilityInfo(name,multiAbil.getMultiAbilities()));
      }
    }
 catch (    Exception|Error e) {
      plugin.getLogger().warning("String_Node_Str" + coreAbil.getName() + "String_Node_Str");
      e.printStackTrace();
      addon.stop();
      ABILITIES_BY_NAME.remove(coreAbil.getName(),coreAbil);
    }
  }
}