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The attached error is shown when pressing the view details on the specific course in the courses page. What should i do?

Warning: Invalid argument supplied for foreach() in C:\wamp64\www\easyJoomla\components\com_tflearn\views\course\tmpl\default.php on line 20

Thank you for informing about the error. This issue will be solved in the next update.

This PHP warning is coming because there are no modules in the course yet. After adding modules to the course, this warning will not come.

tnx

On something related,I am having trouble registering users and sending emails on the contact form of joomla. It says php mail not sent what can i do.

You can check mail settings. Go to System -> Global Configuration. Under "Server" tab, on the bottom right, click on "Send Test Mail".

If you have not received the test mail, then the problem is with the server and PHP settings.

What is the problem in registering users?

when testing mail it says "could not start mail function" the same thing happens when registering users. I am using php mailer to send email.

The problem is with mail() function of PHP. Either with server configuration or with PHP settings. You need to contact your server or hosting provider.