Display 'Last Modified' date in worksheet cells

Hi

I've have a workbook containing 5 worksheets and I have allocated a cell in each sheet to automatically display the date that sheet was last modified. This is to allow for each sheet to present a modified date specific to the worksheet rather than the workbook as a whole.

The code that I have implemented is displaying the "Last Modified: dd mmmm yyyy" string as I require but it is also causing Excel to crash whenever I modify/delete contents from any other cells. I'm not a coder so can anyone assist with debugging the details below please?

Version
Excel 2010 (Excel Macro-Enabled Workbook)

VB Code (against every worksheet)

Private Sub Worksheet_Change(ByVal Target As Excel.Range)
Dim LValue As String
LValue = Format(Now(), "dd mmmm yyyy")
Range("K3") = "Last Modified: " & LValue
End Sub

Error
Microsoft Visual Basic
Run-time error ‘-2147417848 (800 10 108)’:
Method ‘_Default’ of object ‘Range’ failed

Followed by ..... Microsoft Excel has stopped working ….. Restart the program


Any help will be appreciated. Thanks.