Issue with Excel Solver for optimizing smoothning constant in winthers forecasting model

I have the assignment of creating a winthers model for forecasting.

I have to optimize the smoothening constants using the solver, but when i sol using the non-linear function nothing happens.

If there is anyone able to help me locate the issue i would be very grateful.

The task can be found in the tab "Winthers" and the solver parameters should be set up correctly, but is imply cannot figure out why it does not work


BR

OKB1996