Slightly different approach in the attached. If you want a blank task sheet to work from then rather than copying an existing one and clearing it I've created a blank "template" version of it and hidden it away.
The below code attached to a button will unhide the template, copy it, rename the new copy then hide the template away again.
Note I added a new button to the front page as the button you had there kept throwing up an error message when I tried to use that.
Is this anywhere near what you were trying to do?
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