Searching from different workbook and copying values - vb.net

Question

I have 2 wb to_update_example_1 and purchasing_list
basically what I am trying to do is to a loop row by row on workbook to_update_example_1 if the same name is found to copy the a variable to the purchasing_list workbook.
However it keeps giving me error 91 at the searching portion and I would need an advice how do I write vVal2(which is the Qty) to Purchasing list workbook the column is just beside the found name so I tried to use active cell offset but didn't work too
any advice is appreciated thanks
Sub Macro1()
Application.ScreenUpdating = False
Dim x As Integer
Dim vVal1, vVal2 As String
Numrows = Range("A1", Range("A1").End(xlDown)).Rows.Count ' Set numrows = number of rows of data.
Range("A1").Select ' Select cell a2.
For x = 1 To Numrows ' Establish "For" loop to loop "numrows" number of times.
vVal1 = Cells(x, 8)
vVal2 = Cells(x, 7)
Windows("Purchasing List.xls").Activate
ActiveSheet.Cells.Find(What:=vVal1, After:=ActiveCell, LookIn:=xlValues, _
LookAt:=xlPart, SearchOrder:=xlByColumns, SearchDirection:=xlNext, _
MatchCase:=False, SearchFormat:=False).Row
''write to Qty cell beside the found name ActiveCell.Offset(0, -2) = vVal2
Windows("To_update_example_1.xlsm").Activate
''''''''ActiveCell.Offset(1, 0).Select
Next
Application.ScreenUpdating = True
End Sub

Answer 1

When using the Find function, it's recommended if you set a Range object to the Find result, and also prepare your code for a scenario that Find didn't find vVal1 in "Purchasing List.xls" workbook. You can achieve it by using the following line If Not FindRng Is Nothing Then.
Note: avoid using Select, Activate and ActiveSheet, instead fully qualify all your Objects - see in my code below (with comments).
Modified Code
Option Explicit
Sub Macro1()
Application.ScreenUpdating = False
Dim x As Long, Numrows As Long
Dim vVal1 As String, vVal2 As String
Dim PurchaseWb As Workbook
Dim ToUpdateWb As Workbook
Dim FindRng As Range
' set workbook object of "Purchasing List" excel workbook
Set PurchaseWb = Workbooks("Purchasing List.xls")
' set workbook object of "To_update_example_1" excel workbook
Set ToUpdateWb = Workbooks("To_update_example_1.xlsm")
With ToUpdateWb.Sheets("Sheet1") ' <-- I think you are trying to loop on "To_update_example_1.xlsm" file , '<-- change "Sheet1" to your sheet's name
' Set numrows = number of rows of data.
Numrows = .Range("A1").End(xlDown).Row
For x = 1 To Numrows ' Establish "For" loop to loop "numrows" number of times
vVal1 = .Cells(x, 8)
vVal2 = .Cells(x, 7)
' change "Sheet2" to your sheet's name in "Purchasing List.xls" file where you are looking for vVal1
Set FindRng = PurchaseWb.Sheets("Sheet2").Cells.Find(What:=vVal1, LookIn:=xlValues, LookAt:=xlPart, SearchOrder:=xlByColumns)
If Not FindRng Is Nothing Then '<-- make sure Find was successful finding vVal1
' write to Qty cell beside the found name ActiveCell.Offset(0, -2) = vVal2
' Not sure eactly what you want to do now ???
Else ' raise some kind of notification
MsgBox "Unable to find " & vVal1, vbInformation
End If
Next x
End With
Application.ScreenUpdating = True
End Sub

Answer 2

Edited to account for OP's comment about where to search and write values
ShaiRado already told you where the flaw was
here's an alternative code
Option Explicit
Sub Macro1()
Dim cell As Range, FindRng As Range
Dim purchListSht As Worksheet
Set purchListSht = Workbooks("Purchasing List.xls").Worksheets("purchaseData") '(change "purchaseData" to your actual "purchase" sheet name)
Application.ScreenUpdating = False
Application.Calculation = xlCalculationManual
With Workbooks("to_update_example_1").Sheets("SourceData") ' reference your "source" worksheet in "source" workbook (change "SourceData" to your actual "source" sheet name)
For Each cell In .Range("H1", .Cells(.Rows.Count, 8).End(xlUp)).SpecialCells(xlCellTypeConstants) ' loop through referenced "source" sheet column "H" not empty cells
Set FindRng = purchListSht.Columns("G").Find(What:=cell.Value, LookIn:=xlValues, LookAt:=xlPart, SearchOrder:=xlByColumns) ' try finding current cell content in "purchase" sheet column "G"
If Not FindRng Is Nothing Then FindRng.Offset(, -2).Value = cell.Offset(, -1).Value ' if successful, write the value of the cell one column left of the current cell to the cell two columns to the left of found cell
Next
End With
Application.Calculation = xlCalculationAutomatic
Application.ScreenUpdating = True
End Sub