Are you absolutely certain it is the correct file (i.e., not the .tax2017 file for your individual income tax return)? If it is the correct file, it might be corrupt or have some other issue and you should contact TurboTax Customer support.
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
