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If this error is thrown during publication then it means that builder cannot open folder where the website is meant to be published (usually the folder is "public_html" but it can differ depending on hosting control panel).
To fix this error just make sure that you have web root folder in your home directory in file manager. If you are not sure what folder exactly you need to create (or check existence) then contact your hosting provider and provide this FAQ message.

• You accidentally pressed "Reset" or "Change template" button. Check if you have manual or automatic backup enabled. Hover on Publish icon and you will see "Backup/Restore" item;
• You closed the website builder without pressing "Save draft" after creating a website.
  Always make sure you saved your website before closing the browser tab. Also we advise to make website backups regularly.

To solve this problem please take the following steps:

• Open builder in Chrome or Firefox browser;
• Open developer tools in browser (key F12);
• Switch to "Network" tab;
• Click on "Save" button in builder;
• Click on appeared request line (it should begin with "?sess=");
• Switch to "Response" tab;
• Copy text you see in this tab;
• Create ticket on site.pro and tell us about "error loading page" and paste copied text. Our developers will fix this problem;
• Thank you and excuse us for inconvenience.