Which form, which state and what is the exact error message ?
Ok ... the 1095-A form ... column C ... get rid of all the zeros ... leave the box blank.
Others have mentioned that using CUT & PASTE to fill in the form is the issue ... https://ttlc.intuit.com/community/taxes/discussion/i-have-entered-my-3895-form-information-correctly-however-it-is-not-letting-me-continue-prompting-me/00/1821841/page/2
I've had luck getting rid on nonsense error message with saving TurboTax on exit and then reopening it.
Also, if you leave the Step by Step and open with Forms view, the form may be marked with a red exclamation mark. Open the form and it will highlight the field(s) creating the error.