I couldn't take a screen shot, but the error message is Tax paid to Another Stater requires the Other State Tax Return to be attached as a PDF for electronic filing.  A PDF may be attached by going to the E-File tab in the menu and selecting the Attach PDF Files option.

I do know how to attach a PDF file and I have done it but It's the program that doesn't accept the fact that I have attached the file.  I remember from last year, there was the same problem and TT issued an update that changed the type from Other to O/S return and it stated other state return.  I have put in type as other and then for the description put in other state return.  It keeps giving me the error message.