error with Solve App

[resolved]

I have a very simple set of equations in SolveApp, which when solve is pushed, the result is a red x “Solver error”. What am I doing wrong here??? the two equations are below:

0=F + G*4/5
0=-6000 + G*3/5

I put in a seed value of 10000 for G, and still get the error, then put in a seed value for F, -8000 and still get the error.