Have you tried to do a full reset of WordPress and Weaver installation in case something became corrupted.
- Remove the problematic code
- Save all weaver settings
- Download a copy of all weaver settings for good measure
- Switch to a different theme like 2021
- Deactivate and delete ALL weaver theme and plugins
- Redo the latest WordPress Update
- Reinstall weaver Xtreme from WordPress.org and activate
- Reinstall Xtreme theme support plugin from wordpress.ord and activate
- Download a fresh copy of the Xtreme plus plugin from your weaver account, install and activate
- Reinstall other weaver plugins if any from wordpress.org and activate
At this point everything should be back to what it was and you can try adding the code again