Blog Templates causing Option Error

Hello guys, hope you're all well!

I'm curious as to why i'm getting this error when i Live Preview a theme in the backend when a user tries to change their theme:-

Warning: cannot modify header information - headers already sent by (output started at /home/folder/public-html/folder/wp-content/plugins/blogtemplates/blogtemplatefiles/blog_templates.php:81) in /home/bespokeb/public_html/folder/wp-includes/option.php on line 747

Warning: cannot modify header information - headers already sent by (output started at /home/folder/public-html/folder/wp-content/plugins/blogtemplates/blogtemplatefiles/blog_templates.php:81) in /home/bespokeb/public_html/folder/wp-includes/option.php on line 748

Any help would be greatly appreciated :slight_smile:

Kind Regards

~Matt