Can't E File

I see at least one other person has stated that he or she cannot e file due to "a tax form that cannot be e-filed".  I use the same process each year, have the same forms (1099r, and W2) and file married jointly , using standard deductions.  One expert says to wait until 2/1 to e file.  Can someone please elaborate as to why this happening and will I be able to e-file soon or at all?  Thank you.