Why can't I e-file or mail my state/federal returns?

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On another note,  if Social Security is your only income you do not have to file.

For those with additional sources of income, the key figure is the Modified Adjusted Gross Income (MAGI). The MAGI includes half of your Social Security, plus other sources of income. Once your MAGI exceeds the base amount for your filing status ($32,000 for Married Filing Jointly or $25,000 for all others), at least part of your Social Security income becomes taxable. The taxable portion of your Social Security income increases once you reach additional MAGI thresholds.

Most states exempt Social Security.  Again, if your sole income is from Social Security, it's likely you don't need to file a state return either.

For Additional information see this link:  Is my Social Security income taxable