If you're using TurboTax Online, close the program, clear your Cache and Cookies, then return to the FILE section.
Your browser stores recently visited webpages as temporary files in a cache, which enables the pages to load more quickly when revisited.
However, a full or corrupted cache can cause problems in TurboTax, so sometimes you need to clear your cache (that is, remove these temporary files).
Here are the official instructions for the most popular browsers:
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