Thank you for your sending through your template. The issue was with the first row (row 7) with blank input data.
The template cannot calculate with empty or any non-numeric cells. We understand that since your data is based on returns and this is therefore a likely input method.
In order to allow the model to run correctly, you need to move your data up one row to avoid the first row being without data.
Thank you for your patience, enthusiasm and custom.