Hey guys, I’ve got problems edition a page. As soon as I create a classic element, I cannot change it afterwards due to this message:
This element could not render due to invalid template markup. This could be due to changes introduced by a third party plugin. The front end of your site should still function normally
Help would be appreciated
Hello Peter,
Thanks for asking. 
Invalid template markup because of Classic elements was a bug before. However, it had been resolved on Pro 2.3.4, X 6.3.4, Cornerstone 3.3.4,
In that regards, please update your copy of X Theme and Cornerstone from 6.3.1 and 3.3.1 to version 6.3.8 and 3.3.8 respectively to avoid any compatibility issues.
To update theme and plugin, you can take a look at our update guide.
Remember to clear all your caching features (plugin, server-side, CDN, and browser’s cache) after updating so that the code from the latest release is always in use. This will help you to avoid any potential errors.
Thanks.
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