Solver doesn't find the right answer

I have tried to use solver to find the best sets of parameters that can minimize my goal. However, no matter what the starting values are, each time solver is performed, there will be a text box popping up saying that solver found a solution but there is no any change at all. Attached is my worksheet. The solver has already been set up as it is now. It will be really appreciated if somebody can help me out with this. Thank you!