Copying a sheet into same workbook - runtime error 1004.

Hello.

I've written a code to create a duplicate of a pre-made sheet into the same workbook. It worked for a while but now it's giving me runtime error 1004 saying that "Copy method of Worksheet class failed". I'm not sure how to remedy this.

My code is this:

 Sub Create_New_Sheet()

Dim NewName As String
Sheets("Year Template").Copy after:=Worksheets("Year Template")
NewName = InputBox("Input year of data. Warning! Ensure copied sheets contain current year's data!")
ActiveSheet.Name = NewName