There seems to be an issue with your GarageSale database, unfortunately. GarageSale has a built-in repair mechanism that you can try, which may help you.
This is what you need to do:
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Start GarageSale and immediately click and hold down the control-key on your keyboard.
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A small window should appear allowing you to enable “Debug Options”.
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Select “Repair hierarchy”, “Rebuild Indexes”, “Find orphaned listings” and “Remove ghost children from groups”, then hit Continue.
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Give GarageSale some time to startup.
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Check if a “Lost & Found” group has been created and check its content.
Maybe you’re lucky and the ghost listings can be found there so you can delete them.
Please make sure you have a backup before running the debug options!