problems with theme instalattion

[kasiab820]

While installing the theme and child theme i got following error, which I cannot pass through. I have removed the theme and reinstalled it again and get the same error, please explain how to fix it
Warning: Undefined variable $plugin_data_demo in /home/platne/serwer162932/public_html/autoinstalator/libramanagement.eu/wordpress9000/wp-content/themes/coaching/inc/data/demos.php on line 109

Fatal error: Uncaught TypeError: array_merge(): Argument #3 must be of type array, null given in /home/platne/serwer162932/public_html/autoinstalator/libramanagement.eu/wordpress9000/wp-content/themes/coaching/inc/data/demos.php:109 Stack trace: #0 /home/platne/serwer162932/public_html/autoinstalator/libramanagement.eu/wordpress9000/wp-content/themes/coaching/inc/data/demos.php(109): array_merge() #1 /home/platne/serwer162932/public_html/autoinstalator/libramanagement.eu/wordpress9000/wp-content/plugins/thim-core/admin/class-thim-importer.php(109): include(‘…’) #2 /home/platne/serwer162932/public_html/autoinstalator/libramanagement.eu/wordpress9000/wp-content/plugins/thim-core/admin/class-thim-importer.php(424): Thim_Importer::get_demo_data() #3 /home/platne/serwer162932/public_html/autoinstalator/libramanagement.eu/wordpress9000/wp-content/plugins/thim-core/admin/class-thim-getting-started.php(256): Thim_Importer->localize_script() #4 /home/platne/serwer162932/public_html/autoinstalator/libramanagement.eu/wordpress9000/wp-content/plugins/thim-core/admin/class-thim-getting-started.php(238): Thim_Getting_Started->localize_script() #5 /home/platne/serwer162932/public_html/autoinstalator/libramanagement.eu/wordpress9000/wp-includes/class-wp-hook.php(308): Thim_Getting_Started->enqueue_scripts() #6 /home/platne/serwer162932/public_html/autoinstalator/libramanagement.eu/wordpress9000/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters() #7 /home/platne/serwer162932/public_html/autoinstalator/libramanagement.eu/wordpress9000/wp-includes/plugin.php(517): WP_Hook->do_action() #8 /home/platne/serwer162932/public_html/autoinstalator/libramanagement.eu/wordpress9000/wp-admin/admin-header.php(118): do_action() #9 /home/platne/serwer162932/public_html/autoinstalator/libramanagement.eu/wordpress9000/wp-admin/admin.php(239): require_once(‘…’) #10 {main} thrown in /home/platne/serwer162932/public_html/autoinstalator/libramanagement.eu/wordpress9000/wp-content/themes/coaching/inc/data/demos.php on line 109

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