How to find error 500?

Question

WordPress

On the site, I check the registration box for all users, log out and can no longer open the main page and any other page except wp-login.php, it opens normally, if you don’t log out, then everything works fine.

The site itself is here - cr17033-app.tw1.ru
Well, the entry point is cr17033-app.tw1.ru/wp-login.php
Tell me where you can look.

Removed all plug-ins, cleaned almost everything that was possible to zero.
.htaccess restored.

Answer 1

watch logs/turn on error reporting in puff, 500 error is just a signal that everything has fallen, details in the logs.

Answer 2

Here it is written to you: Calling the non-existent bp_core_get_directory_page_ids() function
In the file /home/c/cr17033/app/public_html/wp-content/themes/vikinger/template-part/header/header-logged-out.php
Line 100

Answer 3

cr17033-app.tw1.ru [Tue Jun 08 20:42:16 2021] [error] [pid 16047] sapi_apache2.c(351): [client 31.148.202.221:51542] PHP Fatal error: Uncaught Error: Call to undefined function bp_core_get_directory_page_ids() in /home/c/cr17033/app/public_html/wp-content/themes/vikinger/template-part/header/header-logged-out.php:100\nStack trace:\n#0 /home/ c/cr17033/app/public_html/wp-includes/template.php(732): require()\n#1 /home/c/cr17033/app/public_html/wp-includes/template.php(676): load_template( '/home/c/cr17033...', false, Array)\n#2 /home/c/cr17033/app/public_html/wp-includes/general-template.php(204): locate_template(Array, true, false, Array)\n#3 /home/c/cr17033/app/public_html/wp-content/themes/vikinger/header.php(149): get_template_part('template-part/h...', 'logged- out',Array)\n#4 /home/c/cr17033/app/public_html/wp-includes/template.php(730): require_once('/home/c/cr17033...')\n#5 /home/c /cr17033/app/public_html/wp-includes/template.php(676): load_template('/home/c/cr17033...', true, Array)\n#6 /home/c/cr17033/app/public_html /wp-includes/general-template.php(48): locate_template(Array, true, true, Array)\n#7 /home/c/cr17033/app/public_html/wp-content/ in /home/c/cr17033 /app/public_html/wp-content/themes/vikinger/template-part/header/header-logged-out.php on line 100Array)\n#7 /home/c/cr17033/app/public_html/wp-content/ in /home/c/cr17033/app/public_html/wp-content/themes/vikinger/template-part/header/header-logged -out.php on line 100Array)\n#7 /home/c/cr17033/app/public_html/wp-content/ in /home/c/cr17033/app/public_html/wp-content/themes/vikinger/template-part/header/header-logged -out.php on line 100