After we upgraded to WordPress 5.5, all CRED form notifications stopped working.
When we perform a test email, we get the following error:
AJAX Request failed!
Response Code: 500
Response Message: There has been a critical error on your website.
Hello. Thank you for contacting the Toolset support.
Do you still see the issue - can you please try to check once again.
As I do not able to reproduce the issue with my test site.
This is the form setup with email notification and when I use the "Send Test Email" button - it works as expected and I get the test email in my inbox:
=> hidden link
You can access my test site using:
=> hidden link
user: demo
pwd: Admin@999
Thank you for attending to this issue. I did check the test site that you have created and indeed the notification does work. However, we are using this plugin "WPMail SMTP" to send emails: hidden link.
This is a widely used email sending plug-in (1+ million installations) that replaces the native email sending capabilities of WordPress. Before the upgrade to 5.5, everything worked as expected. After upgrading to 5.5, CRED forms have difficulty interacting with WPMail SMTP. Other email functionalities work fine such as at signup and when people change passwords etc.... These operations do not involve CRED forms and WPMail SMTP does the job. It is only the notifications that are triggered by CRED forms that cause the issue.
I took the liberty of installing "WPMail SMTP" (Latest version 2.3.1) on your test site and sure enough the problem it there.
It seems this is due to WordPress it self has PHPMailer.
When I checked the error logs I found the following fatal error:
[21-Aug-2020 12:35:31 UTC] PHP Fatal error: Cannot declare class PHPMailer\PHPMailer\SMTP, because the name is already in use in /home/minesh/public_html/test1/wordpress/wp-includes/PHPMailer/SMTP.php on line 30
As you can see the Fatal error, there is a chance that the plugin you are using is declaring a class PHPMailer\PHPMailer\SMTP - Can you please recheck with your plugin author and check with them first.
Thank you for your reply. I did check with the makers of "WPMail SMTP" plug-in and they assured me that it is fully compatible with WordPress version 5.5. Since they do have 1 million downloads, if the plugin had any issue, it would have been known by now.
I guess it is is an issue with the interaction between "CRED Forms" and "WPMail SMTP" in WordPress 5.5. I am wondering how many people like me use "WordPress 5.5", "CRED Forms" and "WPMail SMTP" at the same time.
I understand what you are saying but when I deactivate the plugin "WP Mail SMTP" as you can see with my test site for which I shared the access details, the email just works fine.
Would you mind to check with "WP Mail SMTP" and ask them to check your site where you installed the Toolset plugins and check with them if the issue is from Toolset or with "WP Mail SMTP". If they share the information that issue is from Toolset we are happy to fix that.
