I've written a macro with the below code at the beginning:

With Application 
            .DisplayAlerts = False
            .ScreenUpdating = False 
            .EnableEvents = False 
            .Calculation = xlCalculationManual 
End With
When it's run on the majority of computers that use it, it works perfectly, but for some reason when a few people run it, it errors out on the Display Alerts line. Has anybody else experienced this strange error? Is Display Alerts not valid in older versions of Excel?