Constraint "None"

May I know what’s wrong with my constraint syntax to prevent selecting “None” and any other option in a select_multiple question type but it’s not working at all.:
not(selected(.,‘None’) and count-selected(.)>1)

@solotheking, this post discussed previously should help you solve your issue:

Thanks a lot. You’ve saved a situation right now. May you be blessed beyond measure. select_multiple blessing
:pray: :joy:

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