Warning: Cannot modify header information – headers already sent

Hi,

Ever since installing Sahifa, I’ve began getting this error:

Warning: Cannot modify header information – headers already sent by (output started at /home/animecraving/public_html/wp-content/themes/sahifa/functions.php:141) in /home/animecraving/public_html/wp-includes/pluggable.php on line 1173

It happens whenever trying to update a post, make a post, update a plugin, edit a theme file, sometimes visit the non-www version of my website ( https://www.animecraving.tv/ ) – and it’s really preventing me from doing anything!

I’ve contacted the theme author – but I don’t know how long it’ll take to get a reply, so if anyone has any ideas, please let me know!

Regards,