Errors occuring when creating a set of named ranges

[Kaigi]

I'm trying to make my worksheet generate a bunch of named ranges whenever it is activated.

However, I'm getting a "Not a valid name" error on the line in red. The value of r is a string, so I really don't see what the issue is. Another time, I got a object defined error, but I think I've declared everyhing too. That line is very similar to the line above, and tends to work once (the first time around the loop). After that, I get the errors I mentioned.

Private Sub Worksheet_Activate()

    Set wb1 = ActiveWorkbook
    Set ws1 = wb1.Worksheets("Data")
    Set ws2 = wb1.Worksheets("Summary")
    Set ws3 = wb1.Worksheets("Cumulative Number of LDPs")
    Set ws4 = wb1.Worksheets("Setup")
    
    Dim found_proj As Range
    Dim end_row_p As Integer
    Dim end_row2 As Integer
    end_row2 = ws2.Cells(Rows.Count, 2).End(xlUp).Row
    
    'create named range for projects
    wb1.Names.Add Name:=("Proj_List"), _
    RefersTo:=ws4.Range(ws4.Range("AA4"), ws4.Range("AA4").End(xlDown))
    
    'create named range for subsystems in each project
    For Each r In ws4.Range("Proj_List")
        Set found_proj = ws2.Range("A:A").Find(What:=r, LookAt:=xlWhole)
        If Not found_proj Is Nothing Then
            If ws2.Range("A" & found_proj.Row + 1) <> "" Then
                end_row_p = found_proj.Row
            ElseIf ws2.Range("A" & found_proj.Row).End(xlDown).Row > end_row2 Then
                end_row_p = end_row2
            Else
                end_row_p = ws2.Range("A" & found_proj.Row).End(xlDown).Row - 1
            End If
            wb1.Names.Add Name:=(r), _
            RefersTo:=ws2.Range(ws2.Range("B" & found_proj.Row), ws2.Range("B" & end_row_p))
        End If
    Next r

End Sub

If anyone could tell me what i'm doing wrong, I'd be greatful.