Stuck on Sched. C - "Depr allwed or allowable is too large" but I cannot change it

I am self employed and traded in the car I used for business last year for a new car, which I use for business for now. I've written off my old car's expenses for years. Now the error checker is stuck on Schedule C and I cannot edit the fields. It is lines 51 and 52 of Schedule C. The amounts are the same as the amounts in lines 37 and 39. These lines were automatically populated by the software. The error message I get is "Schedule C - (my name and business) - Car & Truck Expenses Worksheet (my car)  Depr allowed or allowable is too large. For disposition calculations, depreciation cannot exceed business basis. Please see Tax Help for this field"

I cannot find any tax help in the software and am unable to edit the numbers on lines 51 and 52. Please help! I have no idea what to do.