I'm trying to fill out 1099-B from e-trade. However, after I fill out Box A (or Box B) I click on Done and there is an error message that I need to fix the errors. ???

When entering your 1099-B you should see a box that states "allow me to continue without this missing information " when you select that box.

Form 1099-B (Proceeds from Broker and Barter Exchange Transactions) reports the sale of stocks, bonds, mutual funds, and other securities.

Here's where you enter or import your 1099-B in TurboTax:

1. Open (continue) your return if it's not already open.
2. In TurboTax, search for "1099-B" or "1099B" (lower-case also works) and then select the "Jump to" link in the search results.
3. Answer Yes to Did you sell any investments in 2017?
   • If you see Here's the investment sales info we have so far, select Add More Sales.
   • If you're in Free Edition or Online Deluxe, follow the instructions to upgrade to Premier.
4. Answer Yes to Did you get a 1099-B or brokerage statement for these sales?
5. At Choose your bank or brokerage or Let Us Enter Your Investment Sale Info, choose how you want to enter your 1099-B (import or type it in yourself).
6. Follow the onscreen instructions.