There are a couple of meanings possible.
1. Some states actually want you to print the form and sign it and then stick it in a drawer. I have no idea why this is.
2. You have some form that needs to be mailed in. Please check forms here. I see that the part year return can be e-filed without an issue but perhaps you have some odd form in there that needed to be mailed? The program should have told you to mail anything extra. I would rather you check that all of your forms were filed.
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