VBA 1004 Error on Loop execution of Macro

Question

Can anybody give me a sense of why I'd be receiving a 1004 error on the following code?

If it's not clear, I'm trying to loop all sheets that are not my named sheet and try to select a particular range and copy and paste it to the compiled "Quant Sheet"

Dim ws As Worksheet
Dim x As Integer 
Dim y As Integer
Dim a As Integer
Dim b As Integer
Set ws = Worksheets("Quant Sheet")
x = 1
y = 3
a = 3
b = 2

Worksheets("Quant Sheet").Activate
For Each ws In ActiveWorkbook.Worksheets
If (ws.Name <> "Quant Sheet") Then

   ws.Range("A3").Select
   Selection.Copy
   Sheets("Quant Sheet").Select
   Cells(y, 1).Select
   ActiveSheet.Paste
   y = y + 1


End If

Next ws

Answer 1

You set WS as Worksheets("Quant Sheet") but then use that same variable ws to use in your loop. That may be causing the issue.

Try this:

Dim ws As Worksheet, mainWS As Worksheet
Dim x As Integer, y As Integer, a As Integer, b As Integer
Set mainWS = Worksheets("Quant Sheet")
x = 1
y = 3
a = 3
b = 2

For Each ws In ActiveWorkbook.Worksheets
If (ws.Name <> "Quant Sheet") Then
   ws.Range("A3").Copy Destination:=mainWS.Cells(y, 1)
   y = y + 1
End If

Next ws

Mainly, you want to avoid using .Select/.Activate to make sure you work more directly with the data.

Edit: FYI you can likely further make this more dynamic by not using something like y=y+1 and instead use offset, or a lastRow variable, but that's personal preference as it'll accomplish the same thing. (I'm also assuming the x, a, and b variables are used elsewhere in your macro...