ChangeLink error

I have this macro that worked last week now it does not? I am not sure what has changed

Run-time error '1004';
Method'ChangeLink' of object'_Workbook' failed

code:

Sub ChangeLink()
    
'Changes Link to Trial Balances
    
    Dim OldLink As String
    Dim NewLink As String
    Dim ws As Worksheet
    Set ws = ThisWorkbook.Worksheets("Woodbury")
    OldLink = ws.Range("K1").Value
    NewLink = ws.Range("K2").Value
    ThisWorkbook.ChangeLink Name:=OldLink, NewName:=NewLink, Type:=xlExcelLinks

Any ideas???