Bad response from server: (500 [error,getplugins]) Internal Server Error

[cbrace]

Hi all,

I am seeing this error message in the webGUI:

Bad response from server: (500 [error,getplugins]) Internal Server Error

I see this in the nginx error log:

2019/02/19 10:59:23 [error] 48155#101476: *12 FastCGI sent in stderr: "PHP Fatal error: Uncaught Error: Call to undefined function json_encode() in /usr/local/www/ruTorrent-master/php/util.php:239
Stack trace:
#0 /usr/local/www/ruTorrent-master/plugins/lookat/lookat.php(60): safe_json_encode(Array)
#1 /usr/local/www/ruTorrent-master/plugins/lookat/init.php(9): rLook->get()
#2 /usr/local/www/ruTorrent-master/php/getplugins.php(495): require_once('/usr/local/www/...')
#3 {main}
thrown in /usr/local/www/ruTorrent-master/php/util.php on line 239" while reading response header from upstream, client: 192.168.2.37, server: localhost, request: "GET /rutorrent/php/getplugins.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "pluto", referrer: "http://pluto/rutorrent/"

Any ideas about what is going wrong here?

I am running
freebsd v11.2
rtorrent v0.9.7_3
rutorrent v3.8
nginx v1.14.2_3,2

TIA

[Novik]

Try to install JSON php extension.
On the normal systems this extension is a part of PHP core - http://php.net/manual/en/json.installation.php
May be FreeBSD is not a normal system, or you use too old PHP version.

[cbrace]

Fixed, thanks