The page content lost after adding the plugin shortcode

Hello.
Its seems like some error is appear at your server.

Please try to deactivate one by one all your active plugins at the WordPress > Plugins menu. Then retest it again.
If its not help, please deactivate your active theme and active the default wordpress theme. And then retest it again. May be there exist some conflict with some active plugin or actual theme and just need to find the reason of that issue.

Otherwise, please recheck your error.log at the server configuration to be sure in the reason of this error. If you can not find this error.log, please contact your support of hosting company about this.
Kind Regards.

Hi,
thank you for the ultra fast respond!
I have checked the error.log from server and I get this error
PHP Fatal error: Call to undefined function imagecreatetruecolor() in /home/admin/web/rhc.bigdrop.gr/public_html/wp-content/plugins/booking/js/captcha/captcha.php on line 93, referer: https://rhc.bigdrop.gr/wp-admin/post.php?post=52&action=edit

So if I dissable the captcha from the plugins settings then it is working properly. What is this error? Can you help me with this?

Thank you!
Best Regards

Hello.
1) Please try to check this troubleshooting instruction if you are having any issues with CAPTCHA: https://wpbookingcalendar.com/faq/captcha-showing-problems/

2) Please recheck that your server was configured for using 2.0 GD library.

Reason
The cause is that you do not have the version 2.0 GD library loaded in PHP which defines this function, which is used for the captcha in this plugin.

Checking
Use this PHP code to view what extensions you have loaded on your hosting account.

<?php
print_r(get_loaded_extensions(
));
print_r(var_dump(gd_info()));
?>

Just create a text file with the four lines above in your public_html folder (or wherever your web root is), name it with a .php extension like “test.php” and then run it by using your web browser like “https://www.yourdomain.com/test.php “

This does not write correct HTML but will show you the info you need. (Just do a View/Source on your browser if you want a nicer looking format.) Look for text like “[some number] => gd”. If you don’t see this, you do NOT have the GD library loaded.

Next you want to look for the version number. Something like: [“GD Version”]=> string(27) “bundled (2.0.28 compatible)”

This needs to say version 2.0 or later.

———–
If you do not see GD version 2.0, you must get your hosting provider to install or upgrade your system.
———–

LEARN MORE:

Learn more about the GD library:
https://www.php.net/manual/en/ref.image.php

Learn more about this function:
https://www.php.net/manual/en/function.imagecreatetruecolor.php

If you are still will have this issue, please recheck the error.log in your server configurations to be sure in a reason of that issue.

3) If you are using Cache plugin (like “WP Super Cache” ), please deactivate it or add the exception to the page with booking form to do not cache this page.

Kind Regards.