Error message: ftp_nlist: Argument 1 (Sftp) must be of type FTP\Connection, null given

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Table of Contents

Problem

At various times, for example when saving settings, the following message may appear:

.../wp-admin/includes/class-wp-filesystem-ftpext.php:438: ftp_nlist: Argument #1 (Sftp) must be of type FTP\Connection, null given

Cause

The server is misconfigured, preventing the PHP process from creating files. As a result, WordPress attempts to create the file required by Borlabs Cookie via FTP instead.

For more information about the WordPress Filesystem API, please refer to: https://codex.wordpress.org/Filesystem_API

Solution

Solution A

Please contact your server administrator and ask them to adjust the file permissions so that the PHP process can create files.

Solution B

Add the required FTP credentials to your WordPress configuration file (wp-config.php).

For more information, please refer to: https://developer.wordpress.org/apis/wp-config-php/

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