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2019/03/11 19:13:21 [error] 26856#100743: *7452 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Uncaught Error: Call to undefined function Q2AMarket\Lion\Admin\qa_get_site_theme() in /htdocs/qa-plugin/lion-options/LionOptions.php:36

Stack trace:

#0 /htdocs/qa-include/qa-base.php(922): Q2AMarket\Lion\Admin\LionOptions->__construct()

#1 /htdocs/qa-include/qa-base.php(949): qa_load_module('page', 'Lion Options')

#2 /htdocs/qa-include/app/options.php(528): qa_load_all_modules_with('option_default')

#3 /htdocs/qa-include/app/options.php(86): qa_default_option('lion_secondary_...')

#4 /htdocs/qa-include/qa-base.php(1857): qa_get_options(Array)

#5 /htdocs/qa-theme/lion/css/css-init.php(71): qa_opt('lion_secondary_...')

#6 /htdocs/qa-theme/lion/css/css-init.php(115): get_lion_op" while reading response header from upstream, client: x.x.x.x, server: blah, request: "GET /qa-theme/lion/css/lion-colors.php?1.0.5-beta HTTP/1.1", upstream: "fastcgi://", host: "blah", referrer: "https://blah/"

PHP Version 7.1.20, NGINX

How to fix it?
Q2A version: 1.8.3
closed with the note: Question about a closed source theme
Taking into account that is a closed-source theme, you should ask for support to the theme developer