急等解决报错：Run-time error '1004'. Application-defined or operation-defined error,该如何

急等解决报错：Run-time error '1004'. Application-defined or operation-defined error
我昨天运行这个还没有问题，今天就不行了，总出报警“Run-time error '1004'. Application-defined or operation-defined error”求高手指点。

Sub COW()
Dim Xx As Integer

Xx = Sheets("Data").Cells(1, 1)  
 
Sheets("Original Data").Select
Do While Cells(Xx, 60) <> "*"
  Cells(Xx + 3, 60) = "*"
  Xx = Xx + 1
Loop

End Sub

[解决办法]
Data表和Original Data表有没有删除？