Error when uploading SIGMA Theme

[my add]

hello I get this error when I try to upload SIGMA Theme to my blogspot
Can you help please?
here’s the error :
We were unable to save your theme.
Your theme could not be parsed as it is not well-formed. Please make sure all XML elements are closed properly. XML error message:
Content is not allowed in prolog.

[Templatesyard]

Install this template with copy and paste method. Read this bottom of the guidance to know the copy and paste installation method. https://gooyaabitemplates.com/how-to-install-blogger-template/

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