wordpress Error establishing a database connection, the page can not display - wordpress

I am very new to Wordpress. I uploaded data to cpanel, but when I tried to borrows the link to display the website I get this message when I look at the error log.
Error establishing a database connection
There were the below two error messages. I hope somebody can help me.
PHP Warning: require(/home/.../public_html/wp-includes/load.php): failed to open stream: No such file or directory in /home/.../public_html/wp-settings.php on line 19
PHP Fatal error: require(): Failed opening required '/home/.../public_html/wp-includes/load.php' (include_path='.:/opt/cpanel/ea-php56/root/usr/share/pear') in /home/.../public_html/wp-settings.php on line 19

Most likely you have a bad (incomplete) file upload.
Try to upload again your Wordpress installation.

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There has been a critical error on your website. Fatal error: require_once(): Failed opening required

I'm trying to upload a theme onto WordPress and keep getting the error message There has been a critical error on your website.
I've checked the error log and this is what I'm receiving.
Warning: require_once(/home/test/dev.website.com/indus/wp-content/themes/grandrestaurant/lib/custom.lib.php): failed to open stream: No such file or directory in /home/test/dev.website.com/indus/wp-content/themes/grandrestaurant/functions.php on line 23
Fatal error: require_once(): Failed opening required '/home/test/dev.website.com/indus/wp-content/themes/grandrestaurant/lib/custom.lib.php' (include_path='.:/opt/alt/php70/usr/share/pear') in /home/test/dev.website.com/indus/wp-content/themes/grandrestaurant/functions.php on line 23
Now, I'm competent but I'm no developer. I'm still very much learning so would appreciate if you could keep it as nooby as possible lol.
Can anyone help me to get this theme installed?

Symfony Compile Error Failed opening required Proxies

I download a new sylius 1.5 project and i deploy it on a sharedhost server. In local all work very well both in dev and prod environnement. But online prod env don't work. Here is the exception in prod log
Uncaught PHP Exception Symfony\Component\Debug\Exception\FatalErrorException:
Compile Error: require(): Failed opening required 'var/cache/prod/doctrine/orm/Proxies/__CG__some-file.php' (include_path='.:/usr/share/php7:/usr/share/php') at vendor/doctrine/common/lib/Doctrine/Common/Proxy/AbstractProxyFactory.php line 223
I don't know how to resolve this problem. thanks
When i laod page for the first time the page it work. But when i click on link or refresh the page i have a blank page with message
this page is currently unable to handle this request
In cPanel Configure PHP INI basic settings section i enable display_errors and when i refresh the page this error is displayed
Fatal error: require_once(): Failed opening required 'phar:///home/ki327452/public_html/acme/vendor/phpstan/phpstan-shim/phpstan.phar/vendor/autoload.php' (include_path='.:/opt/cpanel/ea-php72/root/usr/share/pear') in /home/ki327452/public_html/acme/vendor/phpstan/phpstan-shim/bootstrap.php on line 8
I wait a few moment and when i refresh again it works.And that is a boucle in which i am.

Warning: require(/home/domain/public_html/domainname.com/wp-admin/wp-blog-header.php): failed to open stream: No such file or directory

Warning: require(/home/domain/public_html/domainname.com/wp-admin/wp-blog-header.php): failed to open stream: No such file or directory in /home/domain/public_html/domainname.com/wp-admin/index.php on line 17
Fatal error: require(): Failed opening required '/home/domaine/public_html/domainname.com/wp-admin/wp-blog-header.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/domain/public_html/domainname.com/wp-admin/index.php on line 17
So I have seen this error before once and it actually occurred on this domain prior to today, but I was able to temporarily resolve this by updating Wordpress 4.9.5 from 4.9.4. This has never happened to me on my host with any other site and I have set up dozens over the years with different Wordpress versions.
However, it just started giving me this error again today only on wp-admin/index.php. If I access any other page, like wp-admin/edit.php?post_type=page, the page loads fine.
I have not made any changes to my site aside from adding content and products between last night and today when the error first came up. Disabling all plugins does not fix the issue. There's no error log yet because the site has no errors, it just won't load /wp-admin.
What is going on? I'm happy to provide the real domain name to those who might have an idea.
I was facing the same issue. wp-blog-header.php does not belong to wp-admin directory. This is a virus. I had to download the whole Website and then cleaned with antivirus.

Suddely files started missing from Wordpress and showing errors

My domain: bharahobe.info
I have installed WordPress in main domain and sydney theme. Everything was okay. Suddenly when I visit my site it shows error messages. Like this:
Warning: require(/home/bharahob/public_html/wp-includes/pomo/mo.php):
failed to open stream: No such file or directory in
/home/bharahob/public_html/wp-settings.php on line 102
Fatal error: require(): Failed opening required
'/home/bharahob/public_html/wp-includes/pomo/mo.php'
(include_path='.:/usr/lib/php:/usr/local/lib/php') in
/home/bharahob/public_html/wp-settings.php on line 102
What should I do now?
If you have access through FTP or SSH, you should log into the server and verify that those files exist. The files may have been deleted by a bot or botched upgrade. The permissions may have changed as well.
If the files are actually missing, you can probably get away with downloading the version of WP you're currently running and replace the missing files.

Fatal error when copying wordpress site from server to localhost

I've been trying to create a local copy of this wordpress site - click4taps.co.uk. But even though everything seems to run pretty much fine on the server, on localhost I am getting these code errors, I would have maybe expected a database error if I had forgot something in the setup. I'm not super good at php but I can't see anything that out of place in the code the error specifies.
Here is the error message I receive when trying to launch the site in localhost:
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'woocommerce_layered_nav_init' not found or invalid function name in C:\Program Files (x86)\Ampps\www\click4taps\wp-includes\plugin.php on line 406
Fatal error: Call to undefined function is_product() in C:\Program Files (x86)\Ampps\www\click4taps\wp-content\themes\bazar\theme\plugins\woocommerce-ajax-layered-nav\init.php on line 59
Any feedback on this would be very helpful thanks
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