website fatal error after wordpress upgrade - wordpress

I get this error after upgrading to the last wordpress version
Fatal error: Call to undefined function is_posts_page() in /home/modernis/public_html/wp-content/themes/room09/home.php on line 19
this is the site with the problem: http://modernist.ro/

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PHP Fatal error: Uncaught Error: Call to undefined function wp_kses_normalize_entities() in new wordpress installation

I'm trying to install Wordpress 5.3.2 on NetBSD (unix). phpinfo() tells me I am running Apache/2.4.33 (Unix) PHP/7.2.6
On install.php I get a blank screen and the server log says
Call to undefined function wp_kses_normalize_entities()
As this is at the installation stage, I've not got as far as a Wordpress dashboard, so there are no plugins to disable. What do I do?

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I'm new at making website. Even I only know Html Coding. I'm running a website using WordPress, but it is facing problem everyday at same time. Everyday at the same time site is showing Http 500 error.
So as I don't know any kind of coding, every day I have to delete WordPress from my site then again have to install it then I have to restore website using Updraftplus. But I want to fix this oroblem.
I have an option in my cPanel called "Errors". I find this error from there.
I copied what there was said:
1st error:
[Mon Dec 23 03:46:44.895719 2019] [lsapi:error] [pid 1014092:tid 47766993704704] [client 141.8.188.1:46957] [host gokumovie.com] Backend fatal error: PHP Fatal error: Uncaught Error: Call to undefined function esc_url() in /home/gokumovi/public_html/wp-includes/class-wp-fatal-error-handler.php:190\nStack trace:\n#0 /home/gokumovi/public_html/wp-includes/class-wp-fatal-error-handler.php(147): WP_Fatal_Error_Handler->display_default_error_template(Array, false)\n#1 /home/gokumovi/public_html/wp-includes/class-wp-fatal-error-handler.php(52): WP_Fatal_Error_Handler->display_error_template(Array, false)\n#2 [internal function]: WP_Fatal_Error_Handler->handle()\n#3 {main}\n thrown in /home/gokumovi/public_html/wp-includes/class-wp-fatal-error-handler.php on line 190\n
2nd error :
Backend fatal error: PHP Fatal error: Uncaught Error: Call to undefined function wp_kses_normalize_entities() in /home/gokumovi/public_html/wp-includes/formatting.php:4316\nStack trace:\n#0 /home/gokumovi/public_html/wp-includes/class-wp-fatal-error-handler.php(190): esc_url('https://wordpre...')\n#1 /home/gokumovi/public_html/wp-includes/class-wp-fatal-error-handler.php(147): WP_Fatal_Error_Handler->display_default_error_template(Array, false)\n#2 /home/gokumovi/public_html/wp-includes/class-wp-fatal-error-handler.php(52): WP_Fatal_Error_Handler->display_error_template(Array, false)\n#3 [internal function]: WP_Fatal_Error_Handler->handle()\n#4 {main}\n thrown in /home/gokumovi/public_html/wp-includes/formatting.php on line 4316\n

Getting wordpress pagination error on localhost but working fine on dev

( ! ) Fatal error: Call to undefined function cvf_demo_pagination_load_posts() in C:\wamp64\www\capitalsmartcareers\wp-content\themes\ismart-careers\plugins\ismart\ismart.php on line 277
I have fix this issue after update the php version.This error occur due to latest php version and its working fine on php 5.2 .

Unable to open the wordpress website getting http error

[14-Sep-2018 07:00:57 UTC] PHP Warning: require(/home/website/public_html/learn/wp-includes/embed.php): failed to open stream: No such file or directory in /home/website/public_html/learn/wp-settings.php on line 201
[14-Sep-2018 07:00:57 UTC] PHP Fatal error: require(): Failed opening required '/home/website/public_html/learn/wp-includes/embed.php' (include_path='.:/opt/alt/php71/usr/share/pear') in /home/website/public_html/learn/wp-settings.php on line 201
Getting this error while trying to open the website which is developed in wordpress.This is the sub domain which we created.
Seems like the embed.php is missing in the given directory . did you check it ?

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I am getting the following massage in the error log files of my WordPress blogs:
[10-Oct-2010 04:37:43] PHP Warning: PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-zts-20060613/pdo.so' - /usr/local/lib/php/extensions/no-debug-zts-20060613/pdo.so: undefined symbol: compiler_globals_id in Unknown on line 0
[10-Oct-2010 04:37:43] PHP Warning: PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-zts-20060613/pdo_sqlite.so' - /usr/local/lib/php/extensions/no-debug-zts-20060613/pdo_sqlite.so: undefined symbol: php_pdo_register_driver in Unknown on line 0
What does it mean?
The php configuration is broken or you deleted the php.ini file. Check your php install, check php.ini, or ask your webhost.

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