Method 'Cells of Object' Global failed error

I am receiving the above error when attempting to execute this macro. For some reason the macro works on one computer but not the other.

When I debug it brings me to this point in the macro.

Any suggestions how to correct this would be appreciated.

Thanks

    Cells.Select
    With Selection.Font
        .Name = "Calibri"
        .Size = 10
        .Strikethrough = False
        .Superscript = False
        .Subscript = False
        .OutlineFont = False
        .Shadow = False
        .Underline = xlUnderlineStyleNone
        .ColorIndex = xlAutomatic
        .TintAndShade = 0
        .ThemeFont = xlThemeFontMinor
    End With
    With Selection.Font
        .Name = "Calibri"
        .Size = 11
        .Strikethrough = False
        .Superscript = False
        .Subscript = False
        .OutlineFont = False
        .Shadow = False
        .Underline = xlUnderlineStyleNone
        .ColorIndex = xlAutomatic
        .TintAndShade = 0
        .ThemeFont = xlThemeFontMinor
    End With

You can avoid the select, but I would suggest using the actual worksheet name in the code

    With Worksheets("actual worksheet name").Cells.Font
        .Name = "Calibri"
        .Size = 10
        .Strikethrough = False
        .Superscript = False
        .Subscript = False
        .OutlineFont = False
        .Shadow = False
        .Underline = xlUnderlineStyleNone
        .ColorIndex = xlAutomatic
        .TintAndShade = 0
        .ThemeFont = xlThemeFontMinor
    End With