trying to access demos getting errors

I have been trying to check out the demo to see if this plugin will work for us and if the upload files option is in the free version. I can’t get to your demo pages without this error appearing on the top of every page.

otice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the frontend-post-submission-manager domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /home/u760462130/domains/wpshuffle.com/public_html/demo/wp-includes/functions.php on line 6121

The page I need help with: [log in to see the link]