when I add ads it shows this text why?

@Luka
Do not recognize it.
Can you enable debug log and see what's behind?

I do not know where debug is... When i add new entry to sell or something, it does add it BUT it then redirects me to index.php. and since it's empty i get that error. I checked in settings and it is supposed to redirect me to categories page

https://docs.osclasspoint.com/debug-php-errors

Anyway does not look like problem woth Osclass.

Server -> Client:
Server reported an error:
Server -> Client:
Warning: SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
in /home/c/cl40791/Osclasss/public_html/oc-includes/osclass/utils.php on line 562

Warning: Cannot modify header information - headers already sent by (output started at /home/c/cl40791/Osclasss/public_html/oc-includes/osclass/utils.php:2260) in /home/c/cl40791/Osclasss/public_html/oc-includes/osclass/utils.php on line 2266

This is what i get when it redirects me to index.php page

@Luka
SMTP connect failed.
Means could not connect to your mail client.