I get 500 error on wp-json.

if I try to echo get_rest_url() I get example.com/wp-json, which then gives me error 500. I added RewriteCond %{REQUEST_URI} !^/wp-json to my .htaccess, which gave me 404 error instead.

I use postname as settings for permalinks. I've tried http://example.com/?rest_route=/wp-json/v2/posts as well, and it gives me error 500.

EDIT: Okay, I turned on wp_debug. Now I get the error: Fatal error: Call to undefined function register_rest_route() in /customers/0/2/1/. So this is my new error. Any clue for this?

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    If you get a 500 error, you should be able to check the server's error log for the details of the error. – MrWhite Apr 17 '18 at 11:56
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    Sweet, thanks. I got the error: Call to undefined function register_rest_route(). Any clue what that is? – Sebastian Berglönn Apr 17 '18 at 12:09

Create a .htaccess file with

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

# END WordPress

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