post missing

-Try resetting your custom permalinks back to the default setting and renaming your WordPress .htaccess file. If that works, then try reading Using_Permalinks before setting a custom permalink structure again.

this is how it looks like
https://pinterest.com/pin/238127899020867430/

i did the permalink to default but my post is not showing also my page is not showing. it shows the number but it is not displayed

I got this error
Call to undefined function get_post_format_slugs()

Try:
– switching to the default theme by renaming your current theme’s folder inside wp-content/themes and adding “-old” to the end of the folder name using FTP or whatever file management application your host provides.

– resetting the plugins folder by FTP or phpMyAdmin.

– re-uploading all files & folders – except the wp-content folder – from a fresh download of WordPress. Make sure that you delete the old copies of files & folder before uploading the new ones.

– running the upgrade manually via wp-admin/upgrade.php

Try:

-deactivating ALL plugins temporarily to see if this resolves the problem. If this works, re-activate them individually (one-by-one) to find the problematic plugin(s). If you can’t get into your admin dashboard, try deactivating via FTP or SFTP or whatever file management application your host provides. If applicible, also remember to deactivate any plugins in the mu-plugins folder. The easiest way is to rename that folder to mu-plugins-old.
– To rule out any theme-specific issue, try switching to the unedited default theme for a moment using the WP dashboard. If you don’t have access to your admin area, you can switch to the default theme by renaming your current theme’s folder in wp-content/themes and adding “-old” to the end of the folder name using via FTP or SFTP or whatever file management application your host provides. Alternately, you can remove other themes except the default theme. That will force your site to use it.
– resetting the plugins folder by FTP or PhpMyAdmin. Sometimes, an apparently inactive plugin can still cause problems (because the hooks remain unless plugins completely removed or some plugins stick around in cached files. So by renaming the folder, you break them and force them inactive).

I reuploading and this is the third time reinstall delete clear and reinstall
but still give me the same issues

I need help on this please the post and page is not showing up
if you click the link you see the image of how it looks like

this is the looks upgrade.php
https://pinterest.com/pin/238127899020867514/

now it gives me this error

[error] [client 65.55.213.68] PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘_show_post_preview’ not found or invalid function name in wp-includes/plugin.php on line 406

As suggested earlier, have you tried:

– deactivating ALL plugins?
-swithing to the default 2012 theme?
– restting the plugin folder?

-deactivate -> yes ->rename the folder to mu-plugins-old
-swithing theme -> yes -> the theme folder only twentytwelve
-reinstalling wordpress -> yes

site url?

ibibleverses.com
now it shows nothing and empty

when I eneter https://ibibleverses.com i my browser, it changes to https://ibibleverses.christianpost.com/ immediately upn clicking. And nothing shows up.

the data is showing after I replace files all files (wp-activate.php, etc) the wordpress root almost I replace the whole things
but the site still not showing up even the theme