Change the function kbe_styles() in wp-content\plugins\wp-knowledgebase\wp-knowledgebase.php to:
function kbe_styles(){
if( file_exists( get_stylesheet_directory() . ‘/wp_knowledgebase/kbe_style.css’ ) ){
$stylesheet = get_stylesheet_directory_uri() . ‘/wp_knowledgebase/kbe_style.css’;
} else {
$stylesheet = WP_KNOWLEDGEBASE. ‘template/kbe_style.css’;
}
wp_register_style(‘know-style’, $stylesheet);
wp_enqueue_style(‘know-style’);
}
add_action(‘wp_enqueue_scripts’, ‘kbe_styles’);
