What is causing my code to have 1004 runtime error - excel

Question

I know this code is a mess but it's been at least working with no errors for weeks. The directories of all the files in question exist.
'''
Sub NEW_PO()
'''''''''''''''''''''''''''''''''''Declare Variables''''''''''''''''''''''''''''''''''''''''''''
Dim disc As String
Dim New_Data_Column As Long 'last date ordered column (number)
Dim NewPO_num As String 'New_Data_Column - 10 (needs leading "0" for single digits)
Dim Job_Num As String '= C2
Dim Cost_Code As String '= Active sheet name
Dim lastCol As String 'last date ordered column (Letter)
Dim sht As Worksheet
Dim lastRow As Long 'last row of description column
Set sht = ActiveSheet
''''''''''''''''''''''Find last row and column(letter)''''''''''''''''''''''''''''''''''''''''''
New_Data_Column = Cells(8, Columns.count).End(xlToLeft).Column
lastCol = Split(Columns(Range("A8").End(xlToRight).Column).Address(, False), ":")(1)
lastRow = sht.Cells(sht.Rows.count, 3).End(xlUp).Row
'''''''''''''''''''''''''''''Check for Data'''''''''''''''''''''''''''''''''''''''''''''''''''''
If WorksheetFunction.CountA(Range(lastCol & "11:" & lastCol & lastRow)) = 0 Then
MsgBox "Error! Please enter data to continue."
Exit Sub
ElseIf WorksheetFunction.CountA(Range(lastCol & "10")) = 0 Then
MsgBox "Error! Please enter date to continue."
Range(lastCol & "10").Select
Exit Sub
Else
''''''''''''''''''''''''''''''''Propmt for description of PO''''''''''''''''''''''''''''''''''''
disc = InputBox("Please enter a description for this Purchase Order.", "New Purchase Order")
If disc = "" Then
MsgBox "You Must Enter A Description!"
Exit Sub
End If
''''''''''''''''''''''''''''''''''Set Cost Code''''''''''''''''''''''''''''''''''''''''''''''''
Cost_Code = sht.name
'''''''''''''''''''''''''''''''''Set Job Number''''''''''''''''''''''''''''''''''''''''''''''''
Job_Num = sht.Cells(2, 4).Text 'as text to keep formatting
'''''''''''''''''''''''''''''Set New Purchase Order Number'''''''''''''''''''''''''''''''''''''
sht.Range("A4").Value = sht.Range("A4").Value + 1
If sht.Range("A4").Value < 10 Then
NewPO_num = "0" & sht.Range("A4").Value
Else
NewPO_num = sht.Range("A4").Value
End If
''''''''''''Open PO Template and save as PO number & Copy PO to S/R Log''''''''''''''''''''
Dim sPath As String
sPath = Application.ThisWorkbook.path
Dim i As Integer
Dim wkb1 As Workbook
Dim sht1 As Worksheet
Dim wkb2 As Workbook
Dim sht2 As Worksheet
Dim lastPO_row As Long
Dim lastSR_row As Long
Dim wkb3 As Workbook
Dim sht3 As Worksheet
Dim sht4 As Worksheet
Application.ScreenUpdating = False
Set wkb1 = ThisWorkbook
Set wkb2 = Workbooks.Open(sPath & "\1 CONSTRUCTION\Purchase Orders\Purchase Order Template.xlsm")
Set wkb3 = Workbooks.Open(sPath & "\1 CONSTRUCTION\RECEIVED MATERIALS\SR Log.xlsx")
Set sht1 = wkb1.Sheets(Cost_Code)
Set sht2 = wkb2.Sheets("Sheet1")
Set sht3 = wkb3.Sheets("Sheet1")
Set sht4 = wkb2.Sheets("Job Addresses")
'''
This is where the error is occurring. Normally it would save the template as specified with no problems. I have deleted the code and written it in notepad and pasted it back into excel and it still gives an error. I've tried on multiple computers with the same result. I even uninstalled and reinstalled office and still not working.
'''
wkb2.SaveAs (sPath & "\1 CONSTRUCTION\Purchase Orders\" & Cost_Code & "\" & Job_Num & "-" & NewPO_num
& "-" & Cost_Code & " " & disc & ".xlsm")
wkb3.SaveAs (sPath & "\1 CONSTRUCTION\RECEIVED MATERIALS\" & Cost_Code & "\" & Job_Num & "-" &
NewPO_num & "-" & Cost_Code & " " & disc & ".xlsx")
sht2.name = Job_Num & "-" & NewPO_num & "-" & Cost_Code & " " & disc
lastPO_row = sht2.Cells(sht.Rows.count, 3).End(xlUp).Row + 1
lastSR_row = sht3.Cells(sht.Rows.count, 1).End(xlUp).Row + 1
''''''''''''Copy relevant entries to PO sheet and Shipping/Receiving Log'''''''''''''''''''
For i = 11 To lastRow
If sht1.Cells(i, New_Data_Column).Value <> "" Then
sht1.Range(lastCol & i).Copy
sht2.Range("A" & lastPO_row).PasteSpecial xlPasteValues
sht3.Range("D" & lastSR_row).PasteSpecial xlPasteValues
sht1.Range("B" & i & ":C" & i).Copy
sht2.Range("B" & lastPO_row & ":C" & lastPO_row).PasteSpecial xlPasteValues
sht3.Range("A" & lastSR_row & ":B" & lastSR_row).PasteSpecial xlPasteValues
lastPO_row = lastPO_row + 1
lastSR_row = lastSR_row + 1
End If
Next
sht2.Range("E6").Value = wkb1.Sheets("PM Dashboard").Range("O3").Value
sht2.Range("E7").Value = Job_Num & "-" & NewPO_num & "-" & Cost_Code
sht2.Range("E8").Value = Dashboard.Sheets("PM Dashboard").Range("Y2").Value
'add this job's address to list of addresses on PO
sht4.Range("A7").Value = wkb1.Sheets("PM Dashboard").Range("O3").Value & vbNewLine _
& wkb1.Sheets("PM Dashboard").Range("AP3").Value & vbNewLine & wkb1.Sheets("PM
Dashboard").Range("AP4").Value
wkb2.Save
sht3.Range("C1").Value = Job_Num & "-" & NewPO_num & "-" & Cost_Code & " " & disc
wkb3.Save
wkb3.Close
'''''''''''''''''''''copy over last column and hide previous'''''''''''''''''''''
sht1.Columns(New_Data_Column).Copy
sht1.Columns(New_Data_Column + 1).PasteSpecial Paste:=xlPasteFormats
sht1.Range(lastCol & "8:" & lastCol & "9").Copy
sht1.Range(lastCol & "8:" & lastCol & "9").Offset(0, 1).PasteSpecial Paste:=xlPasteValues
Call HIDE
wkb1.Save
Application.ScreenUpdating = True
End If
End Sub
'''