Plugin Error

Notice: Undefined offset: 0 in /home3/*******/public_html/wp-includes/plugin.php on line 957

Notice: Undefined offset: 0 in /home3/*******/public_html/wp-includes/plugin.php on line 960

Warning: Cannot modify header information – headers already sent by (output started at /home3/*******/public_html/wp-includes/plugin.php:957) in /home3/*******/public_html/wp-includes/functions.php on line 6821

Warning: Cannot modify header information – headers already sent by (output started at /home3/*******/public_html/wp-includes/plugin.php:957) in /home3/*******/public_html/wp-admin/includes/misc.php on line 1310

Warning: Cannot modify header information – headers already sent by (output started at /home3/*******/public_html/wp-includes/plugin.php:957) in /home3/*******/public_html/wp-includes/pluggable.php on line 1355

Warning: Cannot modify header information – headers already sent by (output started at /home3/*******/public_html/wp-includes/plugin.php:957) in /home3/*******/public_html/wp-includes/pluggable.php on line 1358

I have tried this ‘fix’ seen in another thread but it doesnt work for my site. I have removed all themes when trying the fix

Again, it is something specific (non-standard) to your installation.You can try Edit /wp-content/plugins/woo-instant-notifications/admin/class-wcnotifications-instance.php

and delete the line that contains :

$this->placeholders[‘{woocommerce_email_order_meta}’] = $this->woocommerce_email_order_meta();