change include

assets/warmup.php

@@ -26,7 +26,7 @@ if (!$sFileSiteMap) {
     $sFileSitemap = '';
 }
 
-require_once ('../../../../source/bootstrap.php');
+require_once (__DIR__.'/../../../../source/bootstrap.php');
 
 use OxidEsales\Eshop\Core\Config;
 use OxidEsales\Eshop\Core\Registry;