no worry, these are only warnings and no errors. But it’s a problem that these messages are visible on your website because these messages are only for developers and should never be visible on a public website. Do you have access to the PHP settings of your website? If yes, you can search for “PHP Errors and Warnings” and turn it off. We recommend this always for security reasons, because a hacker can provoke such kind of messages and get very sensitive information, and can hack your website.
If you cannot change it in your PHP settings in the hosting panel, please send a mail to info @ 7theme . net, because there is another way to remove these messages.