All of my macros are now failing due to Compile error: Expected Function or variable

Question

I've been using these macros for months and recently every single macro that I normally use is failing due to the Compile error: Expected Function or variable. Here is one example:

Sub Cleaner_Surveillance()
'
' Cleaner_Surveillance Macro
'
    Columns("A:A").Select
    Range("A6").Activate
    Range(selection, selection.End(xlToRight)).Select   -> It highlights the 1st "selection"
    selection.ColumnWidth = 123.86
    Columns("A:F").EntireColumn.AutoFit
    Cells.Select
    Cells.EntireRow.AutoFit
    Rows("6:6").Select
    selection.AutoFilter
    Cells.Select
    Cells.EntireColumn.AutoFit
    Range("A1:F1").Select
'
End Sub

All of my macros fail at the "selection" portion. Even if I write a new macro, it will fail at "selection." Did something get corrupted? I'm using Microsoft Office Professional Plus 2016.