I found an error AFTER I already paid. How do I avoid having to pay twice?

@zboy - 

if you need to amend your return and it doesn't cause the need to upgrade, Turbo Tax is not going to charge anything additional...is that what you are asking? 

Please clarify----did you pay your TurboTax fees but have you not e-filed yet?    We cannot tell from your post whether you have filed your tax return.   If you paid but did not file yet then you can make corrections before you file the return.   If you already filed the tax return, you have to wait for it to be fully processed and then amend it to make corrections.   What  error do you need to fix?

What did you already pay - your TurboTax fees or your tax?