Warning: Constant WPLANG already defined in /customers/2/b/6/promomeuble.be/httpd.www/wp-config.php on line 79

Fatal error: Uncaught Error: Call to undefined function create_function() in /customers/2/b/6/promomeuble.be/httpd.www/wp-content/plugins/testimonials-by-woothemes/classes/class-woothemes-widget-testimonials.php:270
Stack trace:
#0 /customers/2/b/6/promomeuble.be/httpd.www/wp-content/plugins/testimonials-by-woothemes/woothemes-testimonials.php(20): require_once()
#1 /customers/2/b/6/promomeuble.be/httpd.www/wp-settings.php(428): include_once('/customers/2/b/...')
#2 /customers/2/b/6/promomeuble.be/httpd.www/wp-config.php(116): require_once('/customers/2/b/...')
#3 /customers/2/b/6/promomeuble.be/httpd.www/wp-load.php(50): require_once('/customers/2/b/...')
#4 /customers/2/b/6/promomeuble.be/httpd.www/wp-blog-header.php(13): require_once('/customers/2/b/...')
#5 /customers/2/b/6/promomeuble.be/httpd.www/index.php(17): require('/customers/2/b/...')
#6 {main}
  thrown in /customers/2/b/6/promomeuble.be/httpd.www/wp-content/plugins/testimonials-by-woothemes/classes/class-woothemes-widget-testimonials.php on line 270