Information regarding the Run time error 9 - excel

Question

I am trying to copy the range of value from one sheet in excel to another. I have copied this formula from another part of my sheet that works however i cam coming up with the run time error 9.
Sub SaveJambStudEC()
'
' SaveCalcsJambEC Macro
'
Dim page As Integer
page = Cells(4, "T").Value
Range("A70:AN70").Select
Selection.Copy
Range("A71").Select
ActiveCell.Offset(page, 0).Select
Selection.PasteSpecial Paste:=xlPasteValues, Operation:=xlNone, SkipBlanks _
:=False, Transpose:=False
Range("A1:O63").Select
Selection.Copy
Sheets("10.3 JambCalcs EC").Select
Range("A1").Select
ActiveCell.Offset((page - 1) * 63, 0).Select
Selection.PasteSpecial Paste:=xlPasteValuesAndNumberFormats, Operation:=xlNone _
, SkipBlanks:=False, Transpose:=False
Selection.PasteSpecial Paste:=xlPasteFormats
Sheets("9.3 Jamb Design EC").Select
Range("T5").Select
Selection.Copy
Range("N9").Select
Selection.PasteSpecial Paste:=xlPasteValues, Operation:=xlNone, SkipBlanks _
:=False, Transpose:=False
Range("T31").Value = 0
Call JambECsetDesignOptions
Call CopyJambOptiValues
Range("J9").Activate
End Sub

Answer 1

using the below code you will check if there is a sheet with that name. if you dont receive any message box means that there is no sheet with such name
Option Explicit
Sub test()
Dim ws As Worksheet
For Each ws In ThisWorkbook.Worksheets
If ws.Name = "10.3 JambCalcs EC" Then
MsgBox "Sheet Appears"
Exit Sub
End If
Next ws
End Sub
Note
'ThisWorkbook' refer to the workbook that the code included. If you want to clearly declare the workbook you could declare a variable 'Dim wb as Workbook' and then set the workbook 'Set wb=Workbooks("workbook name")'