SpellChecker macro issue

Hello,

I am trying to set a simple spell checking macro for a range of cells on a protected worksheet and I am getting the following Error:
run-time error '1004'
CheckSpelling method of Range class failed

HERE IS THE RECORDED MACRO - ANY HELP WOULD BE APPRECIATED
Sub SpellChecker()
'
' SpellChecker Macro
'

'
Range("C4:K103").Select
Selection.CheckSpelling SpellLang:=1033
ActiveWindow.SmallScroll Down:=-96
Range("C4:F4").Select
End Sub