All the problems

C:\Users\kai\Desktop\Geilomaticer's\src\main\java\com\Geilomaticer\Geilomaticers\items\ender_staff.java:14: error: cannot find symbol
public class ender_staff extends item{
                                 ^
  symbol: class item
C:\Users\kai\Desktop\Geilomaticer's\src\main\java\com\Geilomaticer\Geilomaticers\init\Iteminit.java:17: error: variable TELE_STICK is already defined in class Iteminit
    public static final RegistryObject<Item> TELE_STICK = ITEMS.register("ender_staff",
                                             ^
C:\Users\kai\Desktop\Geilomaticer's\src\main\java\com\Geilomaticer\Geilomaticers\Geilomaticer.java:24: error: cannot find symbol
        Iteminit.ITEMS.register(bus);
                ^
  symbol:   variable ITEMS
  location: class Iteminit
C:\Users\kai\Desktop\Geilomaticer's\src\main\java\com\Geilomaticer\Geilomaticers\Geilomaticer.java:41: error: cannot find symbol
            return Iteminit.TELE_STICK.get().getDefaultInstance();
                                            ^
  symbol:   method getDefaultInstance()
  location: class ender_staff
C:\Users\kai\Desktop\Geilomaticer's\src\main\java\com\Geilomaticer\Geilomaticers\init\Iteminit.java:14: error: type argument ender_staff is not within bounds of type-variable T
    public static final RegistryObject<ender_staff> TELE_STICK = ITEMS.register("ender_staff",
                                       ^
  where T is a type-variable:
    T extends IForgeRegistryEntry<? super T> declared in class RegistryObject
C:\Users\kai\Desktop\Geilomaticer's\src\main\java\com\Geilomaticer\Geilomaticers\init\Iteminit.java:14: error: cannot find symbol
    public static final RegistryObject<ender_staff> TELE_STICK = ITEMS.register("ender_staff",
                                                                 ^
  symbol:   variable ITEMS
  location: class Iteminit
C:\Users\kai\Desktop\Geilomaticer's\src\main\java\com\Geilomaticer\Geilomaticers\init\Iteminit.java:15: error: constructor ender_staff in class ender_staff cannot be applied to given types;
            () -> new ender_staff(new Item.Properties().tab(Geilomaticer.M_GROUP)));
                  ^
  required: no arguments
  found: Properties
  reason: actual and formal argument lists differ in length
C:\Users\kai\Desktop\Geilomaticer's\src\main\java\com\Geilomaticer\Geilomaticers\init\Iteminit.java:17: error: cannot find symbol
    public static final RegistryObject<Item> TELE_STICK = ITEMS.register("ender_staff",
                                                          ^
  symbol:   variable ITEMS
  location: class Iteminit
C:\Users\kai\Desktop\Geilomaticer's\src\main\java\com\Geilomaticer\Geilomaticers\items\ender_staff.java:17: error: method does not override or implement a method from a supertype
    @Override
    ^
C:\Users\kai\Desktop\Geilomaticer's\src\main\java\com\Geilomaticer\Geilomaticers\items\ender_staff.java:20: error: cannot find symbol
        super.addInformation(itemstack, world, list, flag);
        ^
  symbol:   variable super
  location: class ender_staff
10 errors