John F.

It’s oddly. This error refers to the core of wordpress. I can’t say what happened without more information.
You may write me to [email protected] , I need to know what plugin you added and also ftp access.

Hello,
Did you have touched /wp-admin folder? The get_current_screen() function defined in /wp-admin/incudes/screen.php. Does the file exist?

I’m sorry, I wrote about wordpress as a cms.
Wordpress.com doesn’t give all opportunities of wordpress as a cms. Take cheap hosting and install wordpress, and then you will have full control for all options your website.

Hi, it’s oddly. The plugin can’t affect on any WP themes. When once I installed this plugin for my client, the theme had been functioning as usual.

What the theme do you use?

Hi, any themes don’t affect each other. You may plug in any theme any time.

Why do you have such question? Which premium package you mean?

You are great master of WWW, my friend!) But the topic about fatal error and how this fix.

I approve any kinds of backups, and child theme also.

Hi, @respectyoda, please answer my question – how fix the template and don’t edit it?
Are you sorcerer?

Hi, maybe pack of automated installation is not full. Did you try install from common archive from www.ads-software.com?

Hi, Eshan

My technical solution very simple:
1. Open file header.php
2. Comment out (or remove) the call of this function
// check_custom_widget()

Module PHP can’t execute a script, if any function is not found.

Just PHP not found function check_custom_widget() and script died.
Try comment out this call of function in /wp-content/themes/display/header.php on line 77.
Problem in your theme template.

I sent email to you about fix of your website.

Teamviewer is a useless tool in this situation. Do you have plugins on website?

Try create other post and watch what happen. And write domain for your website.

Hi, you may see your content in your database. Write more about what is happened.

Maybe you accidentally moved a post in draft.
How did this happen?