Whenever I use this code shows error 1004

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Run time error 1004 object defined error in following code when debug error show in range("b1").end in sheet 2

What I have tried:

Sub test()

Workbooks("testing.xlsm").Activate
Sheet3.Select
Range("A13:c13").Copy

Sheet4.Select
Range("b1").End(xlDown).Offset(1, 0).Select
Selection.PasteSpecial Paste:=xlPasteValues
Application.CutCopyMode = False



Application.OnTime Now + TimeValue("00:00:10"), "test"
End Sub