To contribute to an
HSA plan, you must have been covered by a High Deductible plan -- that's why
the program is seeing an error.
Please see
TurboTaxDanielV's advice below. He's
correct -- you may actually be under an HDHP, otherwise you generally wouldn't
have been allowed to contribute to the HSA.
https://ttlc.intuit.com/replies/6476383