diff --git a/protokolle.php b/protokolle.php
index b0b11cf..319ffe2 100644
--- a/protokolle.php
+++ b/protokolle.php
@@ -6,22 +6,34 @@
 <pre> <!-- Keep pure text line breaks -->
 <?php
 
-//see https://github.com/vstelmakh/url-highlight
-require '/home/meeehgru/vendor/autoload.php'; //relative path with DIR . concat does not work
-use VStelmakh\UrlHighlight\UrlHighlight;
-$urlHighlight = new UrlHighlight();
+$autoloadPath = '/home/meeehgru/vendor/autoload.php';
 
-$files = glob("./protokolle/osamc_*.txt");
-foreach(array_reverse($files) as $file){
-  $path_parts = pathinfo($file);
-  echo "<h2>" . $path_parts['filename'] . "</h2>";
-  echo "\n";
-  echo $urlHighlight->highlightUrls(file_get_contents($file));
-  echo "\n";
+// Check if autoload.php file exists
+if (!file_exists($autoloadPath)) {
+    echo "<p>PHP Configuration changed. The autoload.php file is missing. Please run <code>composer install</code> or <code>composer require vstelmakh/url-highlight</code>. Please inform the osamc.de staff about this problem.</p>";
+} else {
+    require $autoloadPath;
 
+    // Check if UrlHighlight class exists
+    if (!class_exists(\VStelmakh\UrlHighlight\UrlHighlight::class)) {
+        echo "<p>PHP Configuration changed. Run <code>composer require vstelmakh/url-highlight</code>. Please inform the osamc.de staff about this problem.</p>";
+    } else {
+        // Your existing code goes here
+        use VStelmakh\UrlHighlight\UrlHighlight;
+        $urlHighlight = new UrlHighlight();
 
+        $files = glob("./protokolle/osamc_*.txt");
+        foreach(array_reverse($files) as $file){
+          $path_parts = pathinfo($file);
+          echo "<h2>" . $path_parts['filename'] . "</h2>";
+          echo "\n";
+          echo $urlHighlight->highlightUrls(file_get_contents($file));
+          echo "\n";
+        }
+        // Remove fclose($out); as $out is not defined
+    }
 }
-fclose($out);
+
 ?>
 </pre>
 </body>