Excel Solver- Optimal Fantasy Football Lineup- "Solver could not find a feasible solution"

I am working with the Excel Solver to find the optimal fantasy football roster (maximum projected points). The constraints are:

- Salary Cap of $100,000
- Roster Constraints:
- 1 QB
- 2 to 4 WR
- 2 to 4 WR
- 1 to 3 TE
- 1 Defense
- Total roster size must be 10

I have set up the spreadsheet so that Column A will either be 1 or 0 - 1 being that that player is selected. I have built the constraints into the solver, but it is not working correctly for some reason. It says "Solver could not find a feasible solution." I have gone over the constraints and formulas numerous times, and I cannot figure out why it cannot find a solution. Any help would be greatly appreciated. Thanks!