State tax cannot be more than state distribution, but I don't have an amount in state distribution box., so how do I fix efile error?

IF box 1 and 2a are the same $$ amount...use that $$ amount as the state distribution  (should end up in box 16, even if empty on your paper 1099-R.)

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If box 2a is different from box 1, some claim the state distribution should just be the box 1 value.

I usually claim it should be the box 2a value, as long as the box 2a value has a positive non-zero number in it....but that might depend on which state is involved.