Fatal error: Uncaught Error: Undefined constant "WP_CACHE_KEY_SALT" in /home/httpd/vhosts/kinetic-concept.com/kinetic-concept.ch/wp-content/plugins/w3-total-cache/Util_Debug.php:63
Stack trace:
#0 /home/httpd/vhosts/kinetic-concept.com/kinetic-concept.ch/wp-content/plugins/w3-total-cache/PgCache_ContentGrabber.php(2277): W3TC\Util_Debug::log_filename('pagecache')
#1 /home/httpd/vhosts/kinetic-concept.com/kinetic-concept.ch/wp-content/plugins/w3-total-cache/PgCache_ContentGrabber.php(219): W3TC\PgCache_ContentGrabber::log('start, can_cach...')
#2 /home/httpd/vhosts/kinetic-concept.com/kinetic-concept.ch/wp-content/advanced-cache.php(37): W3TC\PgCache_ContentGrabber->process()
#3 /home/httpd/vhosts/kinetic-concept.com/kinetic-concept.ch/wp-settings.php(95): include('/home/httpd/vho...')
#4 /home/httpd/vhosts/kinetic-concept.com/kinetic-concept.ch/wp-config.php(84): require_once('/home/httpd/vho...')
#5 /home/httpd/vhosts/kinetic-concept.com/kinetic-concept.ch/wp-load.php(50): require_once('/home/httpd/vho...')
#6 /home/httpd/vhosts/kinetic-concept.com/kinetic-concept.ch/wp-blog-header.php(13): require_once('/home/httpd/vho...')
#7 /home/httpd/vhosts/kinetic-concept.com/kinetic-concept.ch/index.php(17): require('/home/httpd/vho...')
#8 {main}
  thrown in /home/httpd/vhosts/kinetic-concept.com/kinetic-concept.ch/wp-content/plugins/w3-total-cache/Util_Debug.php on line 63