Today also i got a problem in my website, it gets a lot of time to load.in today error i got these errors

1.
[27-Jun-2016 03:29:43 UTC] PHP Warning: Cannot modify header information – headers already sent by (output started at /home/nethnews/public_html/index.php:2) in /home/nethnews/public_html/wp-includes/load.php on line 155

2.
[27-Jun-2016 03:34:16 UTC] WordPress database error You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘WHERE AND comment_parent IN (15) ORDER BY comment_date_gmt ASC, comment_ID ASC’ at line 1 for query WHERE AND comment_parent IN (15) ORDER BY comment_date_gmt ASC, comment_ID ASC made by require(‘wp-blog-header.php’), require_once(‘wp-includes/template-loader.php’), include(‘/themes/Newspaper/single_template_5.php’), comments_template, require(‘/plugins/intensedebate/intensedebate-comment-template.php’), id_get_original_comment_template, comments_template, WP_Comment_Query->__construct, WP_Comment_Query->query, WP_Comment_Query->get_comments, WP_Comment_Query->fill_descendants

on 24th this error

[24-Jun-2016 08:07:04 UTC] PHP Fatal error: require(): Failed opening required ‘/home/nethnews/public_html/wp-includes/taxonomy.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/nethnews/public_html/wp-settings.php on line 167

I don’t know what to do please help me if you can.Thank you

Thank you for answering me an what about this issue

26-Jun-2016 16:50:20 UTC] WordPress database error You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘WHERE AND comment_parent IN (18,19,24,28) ORDER BY comment_date_gmt ASC, comme’ at line 1 for query WHERE AND comment_parent IN (18,19,24,28) ORDER BY comment_date_gmt ASC, comment_ID ASC made by require(‘wp-blog-header.php’), require_once(‘wp-includes/template-loader.php’), include(‘/themes/Newspaper/single_template_5.php’), comments_template, require(‘/plugins/intensedebate/intensedebate-comment-template.php’), id_get_original_comment_template, comments_template, WP_Comment_Query->__construct, WP_Comment_Query->query, WP_Comment_Query->get_comments, WP_Comment_Query->fill_descendants

Which file that I have to edit to fix above mention error.so how can optimus mysql.I used w3 total cache plugin.but after that my cpu usage is getting high.any recommned plugin to use for optimus mysql.I know that I asked you a lot of questions.So I don’t have another option to do.Please help again.Thank you.

It is working now.Thank you.Can i change this last 7 days to today popular posts.There i need to get today popular posts.Please help me.Thank you.

Thank you for your cooperation