When your WordPress website crash. What I mean to say crash ? lets example when your website are not opening or opening with blank page or opening with error .
Then to check issue you go to file manager and check your wordpress core files are missing or corrupted or empty .
That’s mean your website crash .
What is wordpress core files ?
wp-admin ,wp-include and others all file under public_html ( except wp-config[dot]php ).
Solution : How to fix ?
There is 3 way to fix
Solution 1 : By WordPress admin
Check your admin part is working or not , If working and able to login WordPress admin then login to wordpress admin and go to update and click on reinstall button . ( you should take backup of database from control panel -> phpmyadmin -> export
Have a look on screenshots
Update ( Screenshot )
Reinstall ( Screenshot )
Now wait till its done .
Solution 2: Restore from your backup . ( if you have paid backup server )
Create ticket , Our team restore backup ( must be you have backup plan )
Solution 3: Restore WordPress manually
Download WordPress from https://wordpress.org/download/
Then upload via file manager : login control panel -> file manager -> domain -> yourdomain.com -> public_html
unzip/extract WordPress file /wodpress folder
Now create a folder name backup and move below folder and files public_html to backup
wp-admin ,wp-include and others all file under public_html ( except wp-config[dot]php )
( note: do not move wp-content and wp-config[dot]php )
Now Move all files and folder except wp-contant from wordpress folder (after unzip it created )
Screenshot : same as above
Now create a [dot]htaccess file under public_html folder ( you can get code from this link https://wordpress.org/support/article/htaccess/ ) ..
Done :0 Please check your website , it should working fine .