Rappadappa77 on "Warning: Cannot modify header information - headers already sent by"

Hello Guys,

Need some help in correcting this error, been searching the forums and didn't quite find an answer I could use, similar ones, but I need to create a new top for myself.

I was trying to edit the functions.php file in my child theme by adding some custom code for WooCommerce, code didn't work and broke my website basically, displaying a Tawk.to error, thought it was the issue solely and deleted the plugin, well any plugin I try to install or remove I get the same error, but admin still works, all I do is refresh the page, so here is the code below.

Warning: Cannot modify header information - headers already sent by (output started at /home/xxxxxx/public_html/mysite.com/wp-content/themes/xxxxxx/functions.php:1) in /home/xxxxxx/public_html/mysite.com/wp-includes/pluggable.php on line 1167

Howard