If your state or federal return requires forms that are not yet ready for filing, or if you state is not accepting tax returns yet, you will be unable to file. You can sign up for email notification, or check back every two or three days. When the forms are ready, you will be able to file.
The articles below list the expected availability dates for state and federal forms.
https://ttlc.intuit.com/questions/1908854-irs-forms-availability-table-for-turbotax-individual-perso...
https://ttlc.intuit.com/questions/1908857-state-forms-availability-table-for-turbotax-individual-per...
