Your software is saying "E-File is not available because your tax return includes a tax situation that can't be e-filed." What is the situation and how can I e-file?

There are many reasons that will prevent you from being allowed to e-file.  See below for more information.  If this is your first time filing and you were under 16 at year-end, the IRS will not allow e-filing for your return.   https://ttlc.intuit.com/replies/3302281