After installing the theme following the instruction my whole /wp-admin/ control panel gave me fatal error:

Fatal error: Uncaught ArgumentCountError: Too few arguments to function TheGem_Mega_Menu::replace_walker_class(), 1 passed in /home/valuech4/public_html/wp-includes/class-wp-hook.php on line 286 and exactly 2 expected in /home/valuech4/public_html/wp-content/themes/thegem/inc/megamenu/megamenu.class.php:180 Stack trace: #0 /home/valuech4/public_html/wp-includes/class-wp-hook.php(286): TheGem_Mega_Menu->replace_walker_class('Menu_Icons_OBFX...') #1 /home/valuech4/public_html/wp-includes/plugin.php(203): WP_Hook->apply_filters('Menu_Icons_OBFX...', Array) #2 /home/valuech4/public_html/wp-content/plugins/themeisle-companion/obfx_modules/menu-icons/init.php(239): apply_filters('wp_edit_nav_men...', '') #3 /home/valuech4/public_html/wp-includes/class-wp-hook.php(286): Menu_Icons_OBFX_Module->check_conflict('') #4 /home/valuech4/public_html/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array) #5 /home/valuech4/public_html/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #6 /home/valuech4/public_html/wp- in /home/valuech4/public_html/wp-content/themes/thegem/inc/megamenu/megamenu.class.php on line 180

Hello, gregor, i've reslved the issue changing the name of the theme from the ftp, and deleting and reinstalling the theme.

thank you