If the error is still there when show post is deactivated, then it is definitely not related to it. A few tests:
A) Deactivate all plugins temporarily, and while they are all deactivated, check it the problem persists.
If the problem disappears when all the plugins are deactivated, then reactivate one by one testing after each to see which plugin activation brings the problem back.
B) If the problem remains with all the plugins deactivated, save and download your weaver settings, then switch to a default WordPress theme and test again to see if the problem remains with the WordPress theme or disappears.
C) If the problem remains with the WordPress theme, then something may be corrupted with WordPress, try redoing the Last WordPress update to refresh the WordPress installation.
D) If the problem disappears with the WordPress theme, then you may want to do a global refresh of all the weaver stuff
- While on the WordPress theme, delete weaver Xtreme and all weaver plugins.
- Then reinstall Xtreme from wordpress.org, and activate Weaver Xtreme and test again.
- Then reinstall / activate weaver plugins from wordpress.org and test after each.