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Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, array callback must have exactly two members in /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/class-wp-hook.php:324 Stack trace: #0 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/plugin.php(205): WP_Hook->apply_filters(Array, Array) #1 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/kses.php(2394): apply_filters('safe_style_css', Array) #2 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/class-wp-theme-json.php(3769): safecss_filter_attr('gap: 0.5em') #3 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/class-wp-theme-json.php(1699): WP_Theme_JSON::is_safe_css_declaration('gap', '0.5em') #4 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/class-wp-theme-json.php(1422): WP_Theme_JSON->get_layout_styles(Array, Array) #5 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/global-styles-and-settings.php(235): WP_Theme_JSON->get_stylesheet(Array, Array) #6 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/script-loader.php(2542): wp_get_global_stylesheet() #7 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/class-wp-hook.php(324): wp_enqueue_global_styles('') #8 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #9 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #10 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/script-loader.php(2299): do_action('wp_enqueue_scri...') #11 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/class-wp-hook.php(324): wp_enqueue_scripts('') #12 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #13 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #14 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/general-template.php(3192): do_action('wp_head') #15 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-content/themes/salient/header.php(16): wp_head() #16 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/template.php(810): require_once('/home/demowebsi...') #17 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/template.php(745): load_template('/home/demowebsi...', true, Array) #18 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/general-template.php(48): locate_template(Array, true, true, Array) #19 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-content/themes/salient/404.php(14): get_header() #20 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/template-loader.php(106): include('/home/demowebsi...') #21 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-blog-header.php(19): require_once('/home/demowebsi...') #22 /home/demowebsiteclien/helpnagar.demowebsiteclient.com/index.php(17): require('/home/demowebsi...') #23 {main} thrown in /home/demowebsiteclien/helpnagar.demowebsiteclient.com/wp-includes/class-wp-hook.php on line 324