How do I get past this error message: "Earlier year taxable social security benefits taxpayer should not be more that $10,917, 85% of the sum of Line B."

I received a lump sum payment from Social Security for tax year 2017. I entered in the amount and the amount from line B. I have rechecked all of the entries. I get this message: "Earlier year taxable social security for taxpayer should not be more than $xxxxx, 85% of the sum of line B.