View difference between Paste ID: jKwaxW4z and 4JtaN2eZ

 local data = {}
 rednet.open("right")
 p = peripheral.wrap("bottom")
 
 function checkSlots(id)
    data = {}
    local slot
    local name
    local slots = p.getAllStacks()
    for i,j in pairs(slots) do
       slot = i
-      name = j["destination"]
+      name = j.all()["myst_book"]["destination"]
 --      print(name)
       data[slot]=name
    end
    rednet.send(id,"done")
 end
 
 function removeSlot(slot)
    p.pushItem("up", slot, 1)
    rs.setOutput("left", true)
    sleep(1)
    rs.setOutput("left", false)
 end
 
 function book(slot,id)
    p.pushItem("up", slot, 1)
    turtle.select(1)
    turtle.drop()
    sleep(5)
    getBook()
    turtle.select(1)
    turtle.dropDown()
    rednet.send(tonumber(id), "done")
 end
 
 function getBook()
    turtle.suck()
 end
 
 function getNames(id)
    local nameTbl = textutils.serialize(data)
    rednet.send(tonumber(id), nameTbl)
 end
 
 while true do
    local id, msg, dis = rednet.receive()
    local newmsg = string.match(msg, "%a+")
 --   print(msg)
    if newmsg == "checkSlots" then
      checkSlots(id)
    elseif newmsg == "getNames" then
      getNames(id)
    elseif newmsg == "remove" then
      removeSlot(tonumber(string.match(msg, "%d+")))
      rednet.send(id,"done")
    elseif newmsg == "books" then
      slot = string.match(msg, "%d+")
      book(tonumber(slot), id)
    end
 end