Hello. The version of PHP on the hosting should be 7.1 or 7.2. Check server logs. If there are errors or blocked requests, then contact the technical support service of your hosting provider.

Thanks for your replies. We have been in touch with our web host to see whether we can suppress error reporting and they have recommended changing to a more recent server. Not sure why the existing one doesn't work any longer.

In case this helps some-one else, we have worked out that when our website (or part of it) is uploaded, a file called imEmailForm_xxxxxxxx.php is created in the imemail folder, where the xs are random letters and/or numbers. If we edit this file and include error_reporting(0); on the line after <?php our form works (i.e. the error message is suppressed) and the website works as we want it to.

We will need to make the above edit each time we upload our website.

Thanks for the update, Debbie.

However, you shouldn't have to manually add that line to each new WebSite X5 form.  You can do that of course if you prefer, but PHP error reporting is normally configured on a more global level.

One way to achieve this is to use an .htaccess file on your server.

Another way is to make an entry in a PHP .ini file on your server.

And the easiest method of all is to use the controls built-in to most webhosting control panels (see the screenshot below):

Your webhost should be able to advise you on how to implement any of these methods to suit your specific requirements.