How Fix warning errors in WordPress

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If you encountered a problem like this:

Warning: call_user_func_array() expects parameter 1 to be a valid callback, class ” not found in /home/grandson/fcgrandson.ch/wp-includes/class-wp-hook.php on line 324

Warning: call_user_func_array() expects parameter 1 to be a valid callback, class ” not found in /home/grandson/fcgrandson.ch/wp-includes/class-wp-hook.php on line 324

Warning: Cannot modify header information – headers already sent by (output started at /home/grandson/fcgrandson.ch/wp-includes/class-wp-hook.php:324) in /home/grandson/fcgrandson.ch/wp- includes/pluggable.php on line 1435

Warning: Cannot modify header information – headers already sent by (output started at /home/grandson/fcgrandson.ch/wp-includes/class-wp-hook.php:324) in /home/grandson/fcgrandson.ch/wp- includes/pluggable.php on line 1438

The problem is that the code in the wordPress core files are not 100% correct, but that still does not mean you will have problems. First of all, make sure that your WordPress version is updated to the latest version. If the problem still appears, you can solve the problem in the following way:

1. Enter the main folder of your wordpress website using FTP.
2. Enter the public folder.
3. In the public folder enter the wp-config.php file. The file can be opened with any text editor.
4. Look in the file for a line where the sentence appears: define( ‘WP_DEBUG’, true );
   and change the word true to the word false;
5. If you don’t see this sentence, simply and this sentencedefine( ‘WP_DEBUG’, false );
6. Save the file.

Now a comment should not appear on the site.