Line 31 of schedule C not computing
My line 29 of schedule C is a negative number. Line 30 is showing up blank since I don't have a home office to deduct. However line 31 is showing up as 0. Also possibly related is my taxable income under this business is showing up as 0. For the at-risk I have "all of my investment in this activity is at risk".
What is causing this error, and how do I fix it