Referring to a new workbook in Excel VBA - excel

Question

In cell K2 in first workbook is written today's date which is the reference for the name of other workbook. I need to take some information from a second open workbook whose file name is today's date ("13.06.2021.xlsx").
I created variable second_workbook which is the date. Then I created variable called "cellscopy" (active cell from first workbook and to copy 3 more cells to the right of it). Then the macro pastes a value in cell I2 in the first workbook (there's a formula in J2 rearranging the account number) and then J2 is the criteria for filter from a third workbook called "Bank accounts.xlsx".
My macro then finds the value from first workbook cell J2 ("criteria") from "Bank accounts.xlsx" in columns I:I and copies a value 5 columns leftward from that cell - a bank acc number corresponding to that batch number.
I created a variable "accnumber" which is then pasted in a filter in a table in the second workbook ("13.06.2021.xlsx"). Then the filtered range from the table is copied and pasted in a new workbook (NewWb) in cell A12. Then I need to go back to the first workbook and copy the "cellscopy" range and paste it again in the new workbook which was created at cell C7.
However, I get a run-time error 438 Object doesn't support this property or method highlighting the last line of my VBA code.
Can you please help me with this issue? I hope I could explain you as clear as possible my problem.
second_workbook = Range("K2").Value
Dim wb As Workbook
Dim actWb As Workbook, newWb As Workbook, shAct As Worksheet, shNew As Worksheet
Dim cellscopy As Range
Set cellscopy = Range(ActiveCell, ActiveCell.Offset(0, 3))
Set actWb = ActiveWorkbook
Set shAct = actWb.Sheets(1)
Set newWb = Workbooks.Add
Set shNew = newWb.Sheets(1)
Set wb = Workbooks(Format(second_workbook, "dd.mm.yyyy") & ".xlsx")
Dim batchnumber As Range
Selection.Copy
Range("I2").Select
ActiveSheet.Paste
Application.CutCopyMode = False
Criteria = Range("J2").Value
Windows("Bank Accounts.xlsx").Activate
Set batchnumber = Range("I:I").Find(Criteria & "TT")
If Not batchnumber Is Nothing Then
batchnumber.Select
End If
ActiveCell.Offset(0, -5).Range("A1").Select
accnumber = ActiveCell
wb.Activate
ActiveSheet.Range("$A$1:$G$654").AutoFilter Field:=5, Criteria1:=accnumber
Range("C1").Activate
Selection.CurrentRegion.Select
Application.CutCopyMode = False
Selection.Copy
newWb.Activate
Range("A12").Select
ActiveSheet.Paste
shAct.Range(cellscopy).Copy Destination:=newWb.Range("C7:F7")
I am getting error 438 at the last line.
I hope I explained as clear as possible my issue. If you could help me I would appreciate it very much

Answer 1

When creating a new workbook, set it as a variable when doing so.
This way it's easy to refer to it.
Dim wb As Workbook
Set wb = Workbooks.Add
I'm also obliged to link to the how to avoid using select post.
edit
Now that you completely changed the question, the rest of this doesn't make much sense.

Answer 2

Please, try the next code. You need to understand that you cannot paste IN A WORKBOOK. You should paste in a sheet range:
Sub testCopyFilterCopy()
Dim shAct As Worksheet, wb2 As Workbook, sh2 As Worksheet, wb3 As Workbook, sh3 As Worksheet
Dim value_for_filter As String, actCell As Range, rngFilt As Range, rngF As Range
Set shAct = ActiveSheet
Set actCell = ActiveCell
value_for_filter = actCell.value
Set wb2 = Windows(Format(Date, "dd.mm.yyyy") & ".xlsx")
Set sh2 = wb2.Worksheets("My sheet") 'Plese use here the appropriate sheet name!!!
Set rngFilt = sh2.Range("$A$1:$G$654")
rngFilt.AutoFilter field:=5, Criteria1:=value_for_filter
On Error Resume Next
'set a range of the filtered cells only:
Set rngF = rngFilt.SpecialCells(xlCellTypeVisible)
On Error GoTo 0
If Not rngF Is Nothing Then
Set wb3 = Workbooks.Add
Set sh3 = wb3.Worksheets(1)
rngF.Copy Destination:=sh3.Range("A12")
shAct.Range(actCell, actCell.Offset(0, 3)).Copy Destination:=sh3.Range("C10")
Else
MsgBox "No visible cells in the range..."
End If
End Sub
You can paste only in a sheet, not in a workbook
If you want to copy the filtered range, you need to use VisibleCells. Otherwise, all the range will be pasted, not only the filtered one.
You should put Option Explicit on top of your module, in order to be obliged to declare all variables.