I am working on a custom Workshop project. It will works with a timer. I mean there will be a product time. So I used hashmap. Code (Text): private HashMap<UUID, Long> wait = new HashMap<UUID, Long>(); private int waittime = 10; full code: https://paste.md-5.net/yuxadecosa.java [ATTACH=full]625801[/ATTACH] [ATTACH=full]625802[/ATTACH] But program says something like that. Whats wrong I didnt understand.