Solver options: a strange error

New Contributor

Office 365, Excel: when I try to modify any option of the Solver (for example the constraint's approximation, or the integer optimization)  I get the error "The approximation must a small positive number". In the top cell you see something like


that does not have any sense. Note that I use the decimal point, not the decimal comma.

Here are two screenshot (sorry, in Italian).

Thank you for any suggestion.