Actually, Line 33 should be the smaller of Line 20 (total tax amount) or Line 32. This line should not be blank, as it's the amount of tax TurboTax calculated on Form 1040, Line 16, plus any amount on Line 17.
If you're using TurboTax Desktop, if there's no amount on Form 1116, Line 20, check Line 16 and 17 on your Form 1040 and enter that amount. Then Line 33 on Form 1116 will have that amount also.
If you're using TurboTax Online, clear your Cache and Cookies first. Then you could delete Form 1116, and step through the interview for Foreign Tax Credit again to repopulate it. Here's How to Delete Forms in TurboTax Online.
I haven't encountered this same error, but with TurboTax Online data can get 'stuck', which is why you clear your browser.
@lindahlb
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