Hello,
First of all thanks for choosing our Theme, we are glad to be you in the WoodMart WordPress family :-)
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I saw the screenshot you attached and visited the URL you provided. Please make sure you have installed and activated all the recommended plugins.
The error seems to be of WP bakery page builder please make sure that you have installed and activated it.
Then Go to WoodMart >> CSS Generator >> Generate CSS file.
Clear cache and check back.
If the problem continues then provide with admin panel login details of the website to check it myself and help you out accordingly.
Best Regards.