Hello,
Thank you very much for choosing our theme and for contacting us.
If you upload the demo by means of theme setup on the existing site with the other third-parties plugins, it may cause problems.
Please follow the instruction on how to install and upload the demo manually. https://xtemos.com/docs/woodmart/installation-process/
Please restore the site from the backup you made before installation and try again.
You can send me the site credentials so that I could check the site settings, sometimes incorrect settings may also cause crashes. Please give me the credentials to check so that I could give you more precise guidance. You can insert the credentials into the Private content below the message block.
Best Regards