This is caused when you site does not have the correct permissions on the server, or the permissions are to restrictive. EE is attempting to create a new temporary folder within /wp-content/ and is unable to do so.
If you add this line of code: define( 'EE_USE_OLD_CSV_REPORT_CLASS', true );
Within your wp-config.php file, somewhere before the line: /* That's all, stop editing! Happy blogging. */
EE will switch to another CSV export method that does not create temporary files on the server. Does it work then?
It can be added to your wp-config.php file. Towards the middle is a safe location and it is usually located in the WordPress root for your site. This is where the wp-content, wp-includes, and wp-admin folders reside.
The WP root can be accessed by logging into your WordPress site using an SFTP or FTP login and your web host would have this information.
Not resolved yet as developer still wading through bug list.
Will let you know if this has been successful.
Thanks
Mark
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