error message

gistfile1.txt

  server Listening on port 4000 +0ms
  app Connected to MongoDB +485ms
/home/mrd2689a/Documents/the_odin_project/Express_MongoDB_Supermarket_Inventory_2/node_modules/bson/lib/error.js:41
        var _this = _super.call(this, message) || this;
                           ^

BSONTypeError: Argument passed in must be a string of 12 bytes or a string of 24 hex characters
    at new BSONTypeError (/home/mrd2689a/Documents/the_odin_project/Express_MongoDB_Supermarket_Inventory_2/node_modules/bson/lib/error.js:41:28)
    at new ObjectId (/home/mrd2689a/Documents/the_odin_project/Express_MongoDB_Supermarket_Inventory_2/node_modules/bson/lib/objectid.js:65:23)
    at ObjectId (/home/mrd2689a/Documents/the_odin_project/Express_MongoDB_Supermarket_Inventory_2/node_modules/bson/lib/objectid.js:25:20)
    at exports.itemGet (/home/mrd2689a/Documents/the_odin_project/Express_MongoDB_Supermarket_Inventory_2/controllers/itemController.js:20:31)
    at Layer.handle [as handle_request] (/home/mrd2689a/Documents/the_odin_project/Express_MongoDB_Supermarket_Inventory_2/node_modules/express/lib/router/layer.js:95:5)
    at next (/home/mrd2689a/Documents/the_odin_project/Express_MongoDB_Supermarket_Inventory_2/node_modules/express/lib/router/route.js:137:13)
    at Route.dispatch (/home/mrd2689a/Documents/the_odin_project/Express_MongoDB_Supermarket_Inventory_2/node_modules/express/lib/router/route.js:112:3)
    at Layer.handle [as handle_request] (/home/mrd2689a/Documents/the_odin_project/Express_MongoDB_Supermarket_Inventory_2/node_modules/express/lib/router/layer.js:95:5)
    at /home/mrd2689a/Documents/the_odin_project/Express_MongoDB_Supermarket_Inventory_2/node_modules/express/lib/router/index.js:281:22
    at param (/home/mrd2689a/Documents/the_odin_project/Express_MongoDB_Supermarket_Inventory_2/node_modules/express/lib/router/index.js:354:14)
[nodemon] app crashed - waiting for file changes before starting...