Cannot modify header information – headers already sent by….

Hello,

I’m getting a series of errors on my website and I’m desperate for help! I have some basic coding skills, but nothing fancy.

Error messages are below WITH the line of code because they are rather long.

Here is what I *know*
1.) Error #1: I think the first error is related to the plugin wp_hooks easy digital downloads. I’ve uninstalled and reactivated ALL of the plugins on my site twice. I have now deleted WP_hooks easy digital downloads plugin. Here is the class-wp-hooks file heading:

<?php
/**
 * Plugin API: WP_Hook class
 *
 * @package WordPress
 * @subpackage Plugin
 * @since 4.7.0
 */

/**
 * Core class used to implement action and filter hook functionality.
 *
 * @since 4.7.0
 *
 * @see Iterator
 * @see ArrayAccess
 */

2.) Error #2 is from a different file (see below)

3.) There are two additional errors on my website, and I've been in contact with Ithemes to fix it.  They are aware of the error and are working on it.  The two errors are: 

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'ithemes_rcp_authorize_net_updater_register' not found or invalid function name in /home2/teamdive/public_html/wp-includes/class-wp-hook.php on line 302

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'ithemes_rcp_limited_quantity_available_updater_register' not found or invalid function name in /home2/teamdive/public_html/wp-includes/class-wp-hook.php on line 302

<strong>Error message #1:</strong>

Warning: Cannot modify header information – headers already sent by (output started at /home2/teamdive/public_html/wp-includes/class-wp-hook.php:302) in /home2/teamdive/public_html/wp-includes/functions.php on line 6712

Warning: Cannot modify header information – headers already sent by (output started at /home2/teamdive/public_html/wp-includes/class-wp-hook.php:302) in /home2/teamdive/public_html/wp-admin/includes/misc.php on line 1310

Warning: Cannot modify header information – headers already sent by (output started at /home2/teamdive/public_html/wp-includes/class-wp-hook.php:302) in /home2/teamdive/public_html/wp-admin/admin-header.php on line 9

Warning: Cannot modify header information – headers already sent by (output started at /home2/teamdive/public_html/wp-includes/class-wp-hook.php:302) in /home2/teamdive/public_html/wp-includes/option.php on line 1097

Warning: Cannot modify header information – headers already sent by (output started at /home2/teamdive/public_html/wp-includes/class-wp-hook.php:302) in /home2/teamdive/public_html/wp-includes/option.php on line 1098`

<strong>Line of code:</strong>
301 } elseif ( $the_[‘accepted_args’] >= $num_args ) {
302 $value = call_user_func_array( $the_[‘function’], $args );
303 } else {

<strong>Error message #2</strong>

Warning: Cannot modify header information - headers already sent by (output started at /home2/teamdive/public_html/wp-admin/includes/file.php:1961) in /home2/teamdive/public_html/wp-includes/functions.php on line 6712

Warning: Cannot modify header information - headers already sent by (output started at /home2/teamdive/public_html/wp-admin/includes/file.php:1961) in /home2/teamdive/public_html/wp-admin/includes/misc.php on line 1310

Warning: Cannot modify header information - headers already sent by (output started at /home2/teamdive/public_html/wp-admin/includes/file.php:1961) in /home2/teamdive/public_html/wp-admin/admin-header.php on line 9

Warning: Cannot modify header information - headers already sent by (output started at /home2/teamdive/public_html/wp-admin/includes/file.php:1961) in /home2/teamdive/public_html/wp-includes/option.php on line 1097

Warning: Cannot modify header information - headers already sent by (output started at /home2/teamdive/public_html/wp-admin/includes/file.php:1961) in /home2/teamdive/public_html/wp-includes/option.php on line 1098

Line of code
1960 $method = ‘ftpsockets’; // Sockets: Socket extension; PHP Mode: FSockopen / fwrite / fread.
1961 }

1962 /**

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