Have you ever tried to update your WordPress plugins and you get a prompt to fill out your FTP Credentials?
The error usually occurs when the following code is missing from wp-config.php file;
define('FS_METHOD','direct');
So you’ll need to go via your FTP program, like FileZilla, and go to the wp-config.php file to insert the code above.
This function allows the current user to edit or install files in your folder.