Wordpress 'call to undefined function cynic_theme_finder()' - wordpress

Wordpress problem on my site, the problem is the site is experiencing technical difficulties.
I have this error
Fatal error: Uncaught Error: Call to undefined function
cynic_theme_finder() in
/home/cyste3u7/public_html/wp-content/themes/cynic/header.php:2 Stack
trace: #0 /home/cyste3u7/public_html/wp-includes/template.php(722):
require_once() #1
/home/cyste3u7/public_html/wp-includes/template.php(671):
load_template('/home/cyste3u7/...', true) #2
/home/cyste3u7/public_html/wp-includes/general-template.php(41):
locate_template(Array, true) #3
/home/cyste3u7/public_html/wp-content/themes/cynic/template-modernpage.php(9):
get_header() #4
/home/cyste3u7/public_html/wp-includes/template-loader.php(78):
include('/home/cyste3u7/...') #5
/home/cyste3u7/public_html/wp-blog-header.php(19):
require_once('/home/cyste3u7/...') #6
/home/cyste3u7/public_html/index.php(17):
require('/home/cyste3u7/...') #7 {main} thrown in
/home/cyste3u7/public_html/wp-content/themes/cynic/header.php on line
2

I have installed a new theme and the errors have disappeared, now the error is Stylesheet is missing. any who can assist

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wordpress admin login throws error but site is working fine

I am running a wordpress woocommerce site. The site is running fine but i go to admin page and login, it throws the following error below. What is strange is that i cant find any reference to this function wplicense_update_check
Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "wplicense_update_check" not found or invalid function name in /home/mysite/public_html/wp-includes/class-wp-hook.php:308
Stack trace: #0 /home/mysite/public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array) #1 /home/mysite/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #2 /home/mysite/public_html/wp-settings.php(639): do_action('wp_loaded') #3 /home/mysite/public_html/wp-config.php(108): require_once('/home/mysite...') #4 /home/mysite/public_html/wp-load.php(50): require_once('/home/mysite...') #5 /home/mysite/public_html/wp-blog-header.php(13): require_once('/home/mysite...') #6 /home/mysite/public_html/index.php(17): require('/home/mysite...') #7 {main} thrown in /home/mysite/public_html/wp-includes/class-wp-hook.php on line 308

how can fix the "Fatal Error " while logging in the website

i just did a backup, and when i tried to log in the website (/wp-admin) this error appears:
Warning: require(/htdocs/wp-includes/version.php): Failed to open stream: No such file or directory in /htdocs/wp-settings.php on line 33
Fatal error: Uncaught Error: Failed opening required '/htdocs/wp-includes/version.php' (include_path='.:/usr/share/php') in /htdocs/wp-settings.php:33 Stack trace: #0 /htdocs/wp-config.php(86): require_once() #1 /htdocs/wp-load.php(50): require_once('/htdocs/wp-conf...') #2 /htdocs/wp-admin/admin.php(34): require_once('/htdocs/wp-load...') #3 /htdocs/wp-admin/index.php(10): require_once('/htdocs/wp-admi...') #4 {main} thrown in /htdocs/wp-settings.php on line 33
for more info this is my website: https://sg-plombier.be/
i don't know what to do now.
Please check if the file exists on the location, if exists then check the file and folder permission.
The file exist o the location, and for the update, I just upload the file (version.php) to the latest version of WordPress. And then these errors appears now:
Fatal error: Uncaught Error: Call to undefined function wp_cache_get() in /htdocs/wp-includes/option.php:165 Stack trace: #0 /htdocs/wp-includes/l10n.php(63): get_option('WPLANG') #1 /htdocs/wp-includes/l10n.php(139): get_locale() #2 /htdocs/wp-includes/l10n.php(766): determine_locale() #3 /htdocs/wp-includes/load.php(1395): load_textdomain('default', '/htdocs/wp-cont...') #4 /htdocs/wp-includes/class-wpdb.php(1815): wp_load_translations_early() #5 /htdocs/wp-includes/class-wpdb.php(734): wpdb->db_connect() #6 /htdocs/wp-includes/load.php(562): wpdb->__construct('sgplo1953451', 'hmeqvf7gos', 'sgplo1953451', '91.216.107.183') #7 /htdocs/wp-settings.php(124): require_wp_db() #8 /htdocs/wp-config.php(86): require_once('/htdocs/wp-sett...') #9 /htdocs/wp-load.php(50): require_once('/htdocs/wp-conf...') #10 /htdocs/wp-admin/admin.php(34): require_once('/htdocs/wp-load...') #11 /htdocs/wp-admin/index.php(10): require_once('/htdocs/wp-admi...') #12 {main} thrown in /htdocs/wp-includes/option.php on line 165
Fatal error: Uncaught Error: Call to a member function set() on null in /htdocs/wp-includes/l10n.php:784 Stack trace: #0 /htdocs/wp-includes/l10n.php(872): load_textdomain('default', '/htdocs/wp-cont...', 'fr_FR') #1 /htdocs/wp-includes/class-wp-fatal-error-handler.php(47): load_default_textdomain() #2 [internal function]: WP_Fatal_Error_Handler->handle() #3 {main} thrown in /htdocs/wp-includes/l10n.php on line 784
I ran into same error, after I disabled and uninstall w3 Total Cache Plugin, I dont know how somehow this plugin interact with the DB upon installation, I solved this by installing the plugin manually to my cpanel or you can use an ftp to your plugin directory...then booom! the admin loads fine.

Wordpress Fatal Error - Yoast SEO plugin activation

I'm trying to activate Yoast SEO plugin but I keep getting this error. Does anybody know what this means and how to fix it?
Fatal error: Uncaught Error: Call to undefined function register_block_type() in /homepages/14/d794412015/htdocs/behzad/wp-content/plugins/wordpress-seo/src/integrations/blocks/structured-data-blocks.php:80 Stack trace: #0 /homepages/14/d794412015/htdocs/behzad/wp-content/plugins/wordpress-seo/src/integrations/blocks/structured-data-blocks.php(71): Yoast\WP\SEO\Integrations\Blocks\Structured_Data_Blocks->register_blocks() #1 /homepages/14/d794412015/htdocs/behzad/wp-content/plugins/wordpress-seo/src/loader.php(201): Yoast\WP\SEO\Integrations\Blocks\Structured_Data_Blocks->register_hooks() #2 /homepages/14/d794412015/htdocs/behzad/wp-content/plugins/wordpress-seo/src/loader.php(137): Yoast\WP\SEO\Loader->load_integrations() #3 /homepages/14/d794412015/htdocs/behzad/wp-content/plugins/wordpress-seo/lib/abstract-main.php(43): Yoast\WP\SEO\Loader->load() #4 /homepages/14/d794412015/htdocs/behzad/wp-content/plugins/wordpress-seo/src/functions.php(36): Yoast\WP\Lib\Abstract_Main->load() #5 /homepages/14/d794412015/htdocs/behzad in /homepages/14/d794412015/htdocs/behzad/wp-content/plugins/wordpress-seo/src/integrations/blocks/structured-data-blocks.php on line 80
Please use this video https://www.youtube.com/watch?v=-5T_xLB3els as guidance to solve your error.

unable to login wordpress localhost xaamp

I am getting an error whenever i try to open http://localhost/wordpress/wp-admin/
Fatal error: Uncaught Error: Call to undefined function mysql_connect() in C:\xampp\htdocs\wordpress\wp-includes\wp-db.php:1668 Stack trace: #0 C:\xampp\htdocs\wordpress\wp-includes\wp-db.php(632): wpdb->db_connect() #1 C:\xampp\htdocs\wordpress\wp-includes\load.php(425): wpdb->__construct('root', '', 'practice_debut', 'localhost') #2 C:\xampp\htdocs\wordpress\wp-settings.php(116): require_wp_db() #3 C:\xampp\htdocs\wordpress\wp-config.php(90): require_once('C:\xampp\htdocs...') #4 C:\xampp\htdocs\wordpress\wp-load.php(37): require_once('C:\xampp\htdocs...') #5 C:\xampp\htdocs\wordpress\wp-blog-header.php(13): require_once('C:\xampp\htdocs...') #6 C:\xampp\htdocs\wordpress\index.php(17): require('C:\xampp\htdocs...') #7 {main} thrown in C:\xampp\htdocs\wordpress\wp-includes\wp-db.php on line 1668
Fatal error: Uncaught Error: Call to undefined function wp_kses_normalize_entities() in C:\xampp\htdocs\wordpress\wp-includes\formatting.php:4316 Stack trace: #0 C:\xampp\htdocs\wordpress\wp-includes\class-wp-fatal-error-handler.php(190): esc_url('https://wordpre...') #1 C:\xampp\htdocs\wordpress\wp-includes\class-wp-fatal-error-handler.php(147): WP_Fatal_Error_Handler->display_default_error_template(Array, false) #2 C:\xampp\htdocs\wordpress\wp-includes\class-wp-fatal-error-handler.php(52): WP_Fatal_Error_Handler->display_error_template(Array, false) #3 [internal function]: WP_Fatal_Error_Handler->handle() #4 {main} thrown in C:\xampp\htdocs\wordpress\wp-includes\formatting.php on line 4316
when i tried for solutions i came across this one "untick mysqli and tick nd_mysqli"
but i don't know how to do this in localhost xamamp. I am new to wordpress and localhost.
Also when i tried to open http://localhost/phpmyadmin/
i get this error
phpMyAdmin - Error
The mysqli extension is missing. Please check your PHP configuration. See [a#doc/html/faq.html#faqmysql#documentation]our documentation for more information.
Try to use Wampserver64 application. Maybe your problem solved.

Wordpress Fatal error

I'm new to wordpress, I got this error when trying to update style.css in wordpress theme, i don't think css cause the crash please help me what cause this problem:
Fatal error: Uncaught Error: Class 'td_mobile_theme' not found in
/home/staging/www/wp-content/themes/Newspaper/mobile/includes/td_global_mob.php:20
Stack trace: #0
/home/staging/www/wp-content/themes/Newspaper/mobile/functions.php(8):
require_once() #1 /home/staging/www/wp-settings.php(424):
include('/home/staging/w...') #2 /home/staging/www/wp-config.php(92):
require_once('/home/staging/w...') #3
/home/staging/www/wp-load.php(37): require_once('/home/staging/w...') #4 /home/staging/www/wp-blog-header.php(13): require_once('/home/staging/w...') #5 /home/staging/www/index.php(17):
require('/home/staging/w...') #6 {main} thrown in
/home/staging/www/wp-content/themes/Newspaper/mobile/includes/td_global_mob.php
on line 20
It appears you're either missing a plugin or it has been deactivated.
From looking at the error message and searching for unique terms, I guess you have the Newspaper-Theme installed. Their website mentions "tagDiv Mobile theme" as an optional plugin. Maybe your theme has been modified so that it's no longer optional but required?
See if that plugin is installed and activated.

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