Try going back through the HSA section of your return where the Form 1099-SA distribution was entered and be sure you have answered the question asking whether the distribution was used entirely to pay for qualified medical expenses. This may clear the error message.
The message seems to indicate that there is an issue with regard to the HSA distribution and the 20% additional tax that is imposed when the distribution is not used for medical purposes.
If this does not clear the error, please share if there is any additional information reported on lines 15 through 17 on your Form 8889. Also include where you are seeing this error message.
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