Print and Mail these form to the government

I have finished my returns and have e-filed them.

 

However, I received this message: 

"Even though you e-filed, Don't Skip This Paperwork.  These forms are required by the government to complete your return."

 

The program does not tell me what forms (aka paperwork) are required by the government.

 

I have gone back in the program twice and tried to print or save these forms--the two choices available in Turbo Tax.  Both times I received this message when I tried to print the forms, "Your forms cannot be printed.  Error in converting your forms to pdf format."  When I tried to save them, I received this message:  "Your forms cannot be saved in pdf format."

 

Any suggestions or is this in error in Turbo Tax software??

 

Thanks!