On the left-side menu, click on 'Tax Tools', then 'Tools', then 'Delete a Form' from the pop-up menu.
You will see a list of forms in your return. Delete the 1099-G's you see there and try re-entering.
Type '1099-G' in the Search area, and 'Jump to 1099-G'.
Click this link for more info on Form 1099-G for Unemployment.
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