PHP Fatal error while installing Thim Core plugin

[vel]

Hi there,

I have a local copy of this site: https://upakar.org/
The site uses a very old theme, so we purchased the latest version. When I try to install the Thim Core plugin, I got the following PHP Fatal error:

[05-Sep-2023 15:39:49 UTC] PHP Notice:  Undefined variable: titan in D:\xampp\htdocs\upakar\wp-content\themes\charitywp\inc\admin\customizer-sections\custom-css.php on line 2
[05-Sep-2023 15:39:49 UTC] PHP Fatal error:  Uncaught Error: Call to a member function createThimCustomizerSection() on null in D:\xampp\htdocs\upakar\wp-content\themes\charitywp\inc\admin\customizer-sections\custom-css.php:2
Stack trace:
#0 D:\xampp\htdocs\upakar\wp-content\themes\charitywp\inc\admin\customize-options.php(52): require_once()
#1 D:\xampp\htdocs\upakar\wp-includes\class-wp-hook.php(310): Thim_Customize_Options->thim_create_customize_options('')
#2 D:\xampp\htdocs\upakar\wp-includes\class-wp-hook.php(334): WP_Hook->apply_filters('', Array)
#3 D:\xampp\htdocs\upakar\wp-includes\plugin.php(517): WP_Hook->do_action(Array)
#4 D:\xampp\htdocs\upakar\wp-content\plugins\thim-core\inc\class-thim-core-customizer.php(185): do_action('thim_customizer...')
#5 D:\xampp\htdocs\upakar\wp-includes\class-wp-hook.php(310): Thim_Core_Customizer->customizer_register('')
#6 D:\xampp\htdocs\upakar\wp-includes\class-wp-hook.php(334): WP_Hook->apply_filters(NULL, Array)
#7 D:\xampp\htdocs\upakar\wp-includes\plugin.php(517): WP_Hook->do_action(Array)
#8 D:\xampp\ in D:\xampp\htdocs\upakar\wp-content\themes\charitywp\inc\admin\customizer-sections\custom-css.php on line 2

I need this error to be resolved.

Thanks,
Vel

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