Delete or rename the theme at:
wp-content\themes\business-prime\
That should then allow you to log in and change theme. After that your site should be working again.
]]>Maybe you could explain to him/her how to do it? I think it involves logging into your website hosts C-Panel, looking for where the files are stored, and manually renaming it there. But I’m not sure how to explain that to a newbie.
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