As someone mentioned above, you will run into this problem when your itemized and standard deductions are within a $300 range of each other.
In my case, the program picked "itemized deductions" for me after running through the charitable donations section. However, the standard deduction + $300 gave me a better tax break. The program was "confused" because it picked both standard & itemized deductions depending on where you were in the program.
The solution for me was to just go back and eliminate all the charitable donations to force the program to pick the standard deduction + $300 in all sections. The error stopped appearing because the $300 was supposed to appear in line 10b.
