#Name? means the specified reference cannot be resolved. If for instance, you added a field to your table and caused the bound column of your listbox to shift, reference may no longer be valid. Also, in effecting your changes, you may now be using a control name and field name that are the same. Why the query wizard does this is beyond me, but it can cause a circular reference.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.