Hi Joe
No problem, I really appreciate your help. “Error 500” as a message is also not very helpful to you, but I think I have found a much better error message meanwhile:
[14-Apr-2023 05:55:10 UTC] PHP Fatal error: Uncaught Error: Call to undefined function mime_content_type() in D:\inetpub\www.mywebsite.com\wp-content\plugins\waymark\inc\Helpers\Waymark_Input.php:456
Stack trace:
0 D:\inetpub\www.mywebsite.com\wp-content\plugins\waymark\inc\Admin\Waymark_AJAX.php(167): Waymark_Input::get_file_contents()
1 D:\inetpub\www.mywebsite.com\wp-content\plugins\waymark\inc\Admin\Waymark_AJAX.php(89): Waymark_AJAX->read_file()
2 D:\inetpub\www.mywebsite.com\wp-includes\class-wp-hook.php(308): Waymark_AJAX->handle_read_file()
3 D:\inetpub\www.mywebsite.com\wp-includes\class-wp-hook.php(332): WP_Hook->apply_filters()
4 D:\inetpub\www.mywebsite.com\wp-includes\plugin.php(517): WP_Hook->do_action()
5 D:\inetpub\www.mywebsite.com\wp-admin\admin-ajax.php(188): do_action()
6 {main}
thrown in D:\inetpub\www.mywebsite.com\wp-content\plugins\waymark\inc\Helpers\Waymark_Input.php on line 456
[14-Apr-2023 05:55:17 UTC] PHP Deprecated: Optional parameter $key declared before required parameter $value is implicitly treated as a required parameter in D:\inetpub\www.mywebsite.com\wp-content\plugins\waymark\inc\Waymark_Config.php on line 200
[14-Apr-2023 05:55:17 UTC] PHP Deprecated: Optional parameter $map_title declared before required parameter $map_data is implicitly treated as a required parameter in D:\inetpub\www.mywebsite.com\wp-content\plugins\waymark\inc\Helpers\Waymark_Helper.php on line 529
The first error is causing the problem, the last two are just for your information. Maybe you can also take care about them.
Many thanks.
Daniel.