Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "get_hex_cache" not found or invalid function name in /homepages/1/d937007229/htdocs/clickandbuilds/top3app/wp-includes/class-wp-hook.php:308
Stack trace:
#0 /homepages/1/d937007229/htdocs/clickandbuilds/top3app/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array)
#1 /homepages/1/d937007229/htdocs/clickandbuilds/top3app/wp-includes/plugin.php(591): WP_Hook->do_action(Array)
#2 /homepages/1/d937007229/htdocs/clickandbuilds/top3app/wp-includes/general-template.php(3043): do_action('wp_head')
#3 /homepages/1/d937007229/htdocs/clickandbuilds/top3app/wp-content/themes/astra/header.php(26): wp_head()
#4 /homepages/1/d937007229/htdocs/clickandbuilds/top3app/wp-includes/template.php(783): require_once('/homepages/1/d9...')
#5 /homepages/1/d937007229/htdocs/clickandbuilds/top3app/wp-includes/template.php(718): load_template('/homepages/1/d9...', true, Array)
#6 /homepages/1/d937007229/htdocs/clickandbuilds/top3app/wp-includes/general-template.php(48): locate_template(Array, true, true, Array)
#7 /homepages/1/d937007229/htdocs/clickandbuilds/top3app/wp-content/themes/astra/page.php(20): get_header()
#8 /homepages/1/d937007229/htdocs/clickandbuilds/top3app/wp-includes/template-loader.php(106): include('/homepages/1/d9...')
#9 /homepages/1/d937007229/htdocs/clickandbuilds/top3app/wp-blog-header.php(19): require_once('/homepages/1/d9...')
#10 /homepages/1/d937007229/htdocs/clickandbuilds/top3app/index.php(8): require('/homepages/1/d9...')
#11 {main}
thrown in /homepages/1/d937007229/htdocs/clickandbuilds/top3app/wp-includes/class-wp-hook.php on line 308
internal_server_error
500