To me, it means that it can't locate the template.
Did you change the template location in the admin area? That's why it may have not worked in the first place.
if you did, and forgot to change it back to the default, and deleted the new template, I think it would give this error.
You could try redownloading the script, and uploading the default template to the location it was set to in the admin. That way it should be able to display the website, and you fix it up.
I hoped that helped.
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