Any idea why I might be getting the following when I try to use Sammu?

--- Lich: sammu active.
-- Running in rank mode
--- Lich: error: undefined method `get_item' for #<Scripting::SAmmu:0x198044a0>
sammu:788:in `get_shaft'
sammu:819:in `check_state'
--- Lich: sammu has exited.