This W2 error is usually eliminated by deleting and re-entering the W2 information. In the Federal interview edit the W2 in question. Be sure to delete/backspace in the boxes 16-20 to eliminate any stray spaces/characters. Re-enter the W2 information for those boxes.
If the boxes on your W2 are actually duplicated, you only need to enter the line once.
Additionally, you might delete the entire W2 and re-enter all the information as an added step.
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