Can't pickup items?

For some odd reason, the mob drops the items... but I can't pick them up..

Code:

            List<ItemStack> drops = new ArrayList<ItemStack>();
            for (String s : newDrop) {
                int id = 0;
                byte meta = 0;
                int amt = 0;
                short dmg = 0;
 
                String[] split = s.split(":");
                if (split.length == 4) {
                    String idS = split[0];
                    String metaS = split[1];
                    String amtS = split[2];
                    String dmgS = split[3];
 
                    try {
                        id = Integer.parseInt(idS);
                        meta = Byte.parseByte(metaS);
                        amt = Integer.parseInt(amtS);
                        dmg = Short.parseShort(dmgS);
 
                        ItemStack newItem = new ItemStack(id);
                        newItem.setAmount(amt);
                        newItem.getData().setData(meta);
                        newItem.setDurability(dmg);
                        drops.add(newItem);
                    } catch (Exception e) {
                        id = 0;
                        meta = 0;
                        amt = 0;
                        dmg = 0;
                    }
                }
            }
            event.getDrops().addAll(drops);
        }

 

pkt
And you can pick items up other than those mob drops? Do you have any plugins that cancel the PlayerPickupItemEvent?

 

nope its just the drops from this code I cant pickup

 

Sorry I've been away from this topic for so long, but does anyone know the problem, or solution?