Due Date validation in SharePoint

I would like Validation set on Field "Due Date" in SharePoint list so that IF due date is 14 days or less then the"created" date then have message "Please give Us more time, etc..."

I tried adding the following formula =IF(DATEDIF([Due Date], [Created],"d")>14,"No","Yes") to the Due date column validation formula box

but it does not work I get error

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