Can I replace my Wordpress function.php? - php

I keep getting this error and IDK php can I replace the whole file somehow?
Fatal error: Uncaught Error: Call to undefined function get_template_directory() in /home/campbel/public_html/wp-includes/functions.php:8580 Stack trace: #0 /home/campbel/public_html/wp-settings.php(98): require() #1 /home/campbel/public_html/wp-config.php(91): require_once('/home/campbel/p...') #2 /home/campbel/public_html/wp-load.php(37): require_once('/home/campbel/p...') #3 /home/campbel/public_html/wp-blog-header.php(13): require_once('/home/campbel/p...') #4 /home/campbel/public_html/index.php(17): require('/home/campbel/p...') #5 {main} thrown in /home/campbel/public_html/wp-includes/functions.php on line 8580

The best course of action is to update or reinstall your WP. Don't forget to create a backup copy before you do anything (including the database).

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Fatal error: Uncaught Error: Call to undefined function apply_filters() in /public_html/wp-includes/error-protection.php:119

I want to transfer one wordpress website. After transfer I update old domain to new domain in wordpress files and database also by code. When I am trying to open website, this error is display.
Fatal error: Uncaught Error: Call to undefined function apply_filters() in /home/myserver/public_html/wp-includes/error-protection.php:119 Stack trace: #0 /home/myserver/public_html/wp-includes/error-protection.php(83): wp_is_fatal_error_handler_enabled() #1 /home/myserver/public_html/wp-settings.php(64): wp_register_fatal_error_handler() #2 /home/myserver/public_html/wp-config.php(86): require_once('/home/myserver...') #3 /home/myserver/public_html/wp-load.php(37): require_once('/home/myserver...') #4 /home/myserver/public_html/wp-blog-header.php(13): require_once('/home/myserver...') #5 /home/myserver/public_html/index.php(17): require('/home/myserver...') #6 {main} thrown in /home/myserver/public_html/wp-includes/error-protection.php on line 119
I replaced wp-settings.php file with latest file from wordpress. Any help will be apriciated. Thanks in advance.

Why I get this message when I open my wordpress site (how to solve it)?

Undefined constant "‘FS_METHOD’" in /Applications/XAMPP/xamppfiles/htdocs/wordpress/wp-config.php:98 Stack trace: #0 /Applications/XAMPP/xamppfiles/htdocs/wordpress/wp-load.php(50): require_once() #1 /Applications/XAMPP/xamppfiles/htdocs/wordpress/wp-login.php(12): require('/Applications/X...') #2 {main} thrown in /Applications/XAMPP/xamppfiles/htdocs/wordpress/wp-config.php on line 98
The error says that it is looking for the constant FS_METHOD and fails to find it. This is something you can set in your wp-config.php - I would try and set it as explained here: https://warptheme.com/wordpress-tutorials/update-wordpress-directly-without-using-ftp/
Kind regards,

PHP Fatal error: Uncaught Error: Call to undefined function as_next_scheduled_action()

When I tried to update Woocommerce plugin into new version (3.6.1) I got this error
[21-Apr-2019 20:29:10 UTC] PHP Fatal error: Uncaught Error: Call to
undefined function as_next_scheduled_action() in
/home/tleelxvn/fairo.pk/wp-
content/plugins/woocommerce/includes/queue/class-wc-action-queue.php:127
Stack trace:
#0 /home/tleelxvn/fairo.pk/wp-content/plugins/woocommerce/includes/admin/marketplace-suggestions/class-wc-marketplace-updater.php(30):
WC_Action_Queue->get_next('woocommerce_upd...')
#1 /home/tleelxvn/fairo.pk/wp-includes/class-wp-hook.php(286): WC_Marketplace_Updater::init('')
#2 /home/tleelxvn/fairo.pk/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array)
#3 /home/tleelxvn/fairo.pk/wp-includes/plugin.php(465): WP_Hook->do_action(Array)
#4 /home/tleelxvn/fairo.pk/wp-settings.php(505): do_action('init')
#5 /home/tleelxvn/fairo.pk/wp-config.php(79): require_once('/home/tleelxvn/...')
#6 /home/tleelxvn/fairo.pk/wp-load.php(37): require_once('/home/tleelxvn/...')
#7 /home/tleelxvn/fairo.pk/wp-cron.php(39): require_once('/home/tleelxvn/...')
#8 {main}
thrown in /home/tleelxvn/fairo.pk/wp-content/plugins/woocommerce/includes/queue/class-wc-action-queue.php
on line 127
I came up against this exact problem today. My situation may be unique, but if what I learned helps anyone, all the better.
In my situation, I have code within my theme where I'll force load WooCommerce if it isn't loaded. The site requires WooCommerce on an AJAX call that otherwise knows nothing about WordPress. In normal WordPress requests, the plugin is already loaded, so my code block does nothing.
However, I received this error when I stood up a new site with the same repo and I had not yet activated the WooCommerce plugin. As soon as I activated it, the error disappeared. The reason the error occurred is because the required file only gets included on the plugins_loaded action, which in my scenario had already been run by the time I force-loaded WooCommerce.

Error while running Laravel-snappy html to pdf

I installed laravel-snappy using the official documentation but when i try to run my application i get this error.
Fatal error: Uncaught Error: Call to undefined method Illuminate\Foundation\Application::configure() in D:\php\myapp\vendor\barryvdh\laravel-snappy\src\LumenServiceProvider.php:21 Stack trace: #0 D:\php\myapp\vendor\laravel\framework\src\Illuminate\Foundation\Application.php(574): Barryvdh\Snappy\LumenServiceProvider->register() #1 D:\php\myapp\bootstrap\app.php(35): Illuminate\Foundation\Application->register(Object(Barryvdh\Snappy\LumenServiceProvider)) #2 D:\php\myapp\public\index.php(36): require_once('D:\php\myapp\bo...') #3 D:\php\myapp\server.php(21): require_once('D:\php\myapp\pu...') #4 {main} thrown in D:\php\myapp\vendor\barryvdh\laravel-snappy\src\LumenServiceProvider.php on line 21
Another one :
when i use anchor tag for routing a download like below
Download PDF
It goes to
http://localhost:8000/%7B%7B%20route('generate-pdf',['download'=%3E'pdf'])%20%7D%7D
why is it like that?
Why do i get this error and how do i resolve it? thanks in advance.

Have an error on every page using AnchorCMS

I am using AnchorCMS and I am getting the same message on every page:
Uncaught Exception
Undefined offset: 6
Origin
on line 90
Trace
#0 [internal function]: System\Error::shutdown()
#1 {main}
I have already seen this post but it does not fix the problem in a "clean" way (it's just a workaround I think).

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