Fatal error

Dear support

When install the theme, I get the error as written below. Could you please inform me on what the problem is?

Also the homepage does look wrong.

Please look at kltr.dk

Thank you

Asger

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Error:

Fatal error: Uncaught Exception: Expected single stylesheet key. in /var/www/kltr.dk/public_html/wp-includes/customize/class-wp-customize-custom-css-setting.php:71 Stack trace: #0 /var/www/kltr.dk/public_html/wp-includes/class-wp-customize-manager.php(5617): WP_Customize_Custom_CSS_Setting->__construct(Object(WP_Customize_Manager), ‘custom_css[]’, Array) #1 /var/www/kltr.dk/public_html/wp-includes/class-wp-hook.php(286): WP_Customize_Manager->register_controls(Object(WP_Customize_Manager)) #2 /var/www/kltr.dk/public_html/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array) #3 /var/www/kltr.dk/public_html/wp-includes/plugin.php(465): WP_Hook->do_action(Array) #4 /var/www/kltr.dk/public_html/wp-includes/class-wp-customize-manager.php(928): do_action(‘customize_regis…’, Object(WP_Customize_Manager)) #5 /var/www/kltr.dk/public_html/wp-includes/class-wp-hook.php(286): WP_Customize_Manager->wp_loaded(”) #6 /var/www/kltr.dk/public_html/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array) in /var/www/kltr.dk/public_html/wp-includes/customize/class-wp-customize-custom-css-setting.php on line 71