Find all tabs with formula errors

I'm want to write a macro that searches each tab in my workbook to see if there are any formula errors and if there are to change the tab color so I know to go look at that tab. I'm really not sure where to start.

Thanks for your help.

I managed to figure it out. I only wanted to do it for tabs with names beginning with "#" that's why there is that extra if statement.

 Dim sh As Worksheet
 Dim r As Range
 
For Each sh In ThisWorkbook.Worksheets
    If Left(sh.Name, 1) = "#" Then
        For Each r In sh.UsedRange
            If IsError(r) Then
                With sh.Tab
                    .ThemeColor = xlThemeColorAccent4
                    .TintAndShade = 0
                End With
            End If
        Next
    End If
Next