"Invalid use of ME keyword" when trying to loop through all userform controls

I have a userform with textboxes as well as other objects. I'm working off a textbook and it uses similar code in the chapter. When I'm trying it I'm getting the error message "Invalid use of ME keyword"

Private Sub UserForm_Initialize()

'frmInputs.Show
Dim ctl As Control

For Each ctl In Me.Controls
'    If TypeName(ctl) = "textbox" Then
'        ctl.Value = ""
'    End If
Next
End Sub

I also looked up online and tried copying and pasting their code and got the same error message