diff --git a/Load.php b/Load.php
index 070c72c..c82b6c3 100644
--- a/Load.php
+++ b/Load.php
@@ -12,26 +12,53 @@
 class Load
 {
     
+    static protected $file;
     static protected $autoload;
-    
-    static public function autoload($class)
+
+    static public function setAutoloadFrom($file)
     {
-        if (! isset(self::$autoload[$class])) {
-            throw new MJException('There is no such class "' . $class . '" in autoload.');
+        self::$file = $file;
+        if (!file_exists(self::$file)) {
+            self::buildAutoload();
         }
-        require(PATH . self::$autoload[$class]);
+        self::$autoload = require(self::$file);
     }
     
-    static public function setAutoloadFrom($file)
+    static public function autoload($class)
     {
-        if (! file_exists($file)) {
-            throw new MJException('Autoload source doesn\'t exists! Try to generate it!');
+        if (isset(self::$autoload[$class])) {
+            require(PATH . self::$autoload[$class]);
+            return;
+        }
+        if (defined('DEBUG') && DEBUG == true) {
+            if (!isset(self::$autoload[$class])) {
+                self::buildAutoload();
+            }
+            if (isset(self::$autoload[$class])) {
+                require(PATH . self::$autoload[$class]);    
+            }
         }
-        self::$autoload = require($file);
     }
     
     static public function getFilePath($class)
     {
         return self::$autoload[$class];
     }
+    
+    static protected function buildAutoload()
+    {
+        ignore_user_abort(true);
+        $dir = dirname(self::$file);
+        if (!file_exists($dir) && !mkdir($dir)) {
+            trigger_error('Can\'t create directory: "' . $dir . '"', E_USER_ERROR);
+        }
+        
+        $scan = array(PATH . '/lib', PATH . '/' . APP . '/src');
+        
+        require_once(PATH . '/lib/core/util/AutoloadBuilder.php');
+        
+        $builder = new AutoloadBuilder(self::$file, $scan);
+        $builder->build();
+        ignore_user_abort(false);
+    }
 }
\ No newline at end of file
diff --git a/app/FrontController.php b/app/FrontController.php
index 465f3c8..6ca28c7 100644
--- a/app/FrontController.php
+++ b/app/FrontController.php
@@ -104,24 +104,37 @@ class FrontController
         return $this->router;
     }
     
-    
     public function execute()
     {
         
         try {
-            $request = Env::getRequestUri();
-            $route = $this->getRouter()->route($request);
-            if (! $route) {
-                throw new Exception('Route "' . $request . '" not found');
-            }
-            
-            $action_class = $route->getAction();
-            $action = new $action_class();
-            $layout_class = $route->getLayout();
-            $layout = new $layout_class();
-            return $layout->fetch($action);
+            //try {
+                $request = Env::getRequestUri();
+                $route = $this->getRouter()->route($request);
+                if (!$route) {
+                    throw new Exception('Route "' . $request . '" not found');
+                }
+                
+                $action_class = $route->getAction();
+                $action = new $action_class();
+                $layout_class = $route->getLayout();
+                $layout = new $layout_class();
+                return $layout->fetch($action);
+            //} catch (GeneralException $e) {
+            //    throw $e;
+            //} /*catch (Exception $e) {
+                throw new GeneralException($e->getMessage(), $e->getCode());
+            //} */
         } catch (Exception $e) {
-            throw $e;
+            var_dump($e);
+            die('111');
+            
+            /*if (DEBUG == true) {
+                return $e->toHtml();
+            } else {
+                $layout = new ErrorLayout();
+                return $layout->fetch($e->getCode());
+            } */
         }
     }
 }
\ No newline at end of file
diff --git a/exception/Error404Exception.php b/exception/Error404Exception.php
new file mode 100644
index 0000000..0f6b6e0
--- /dev/null
+++ b/exception/Error404Exception.php
@@ -0,0 +1,23 @@
+<?php
+/**
+ * @copyright NetMonsters <team@netmonsters.ru>
+ * @link http://netmonsters.ru
+ * @package Majestic
+ * @subpackage exception
+ * @since 2010-02-26
+ * @version SVN: $Id$
+ * @filesource $URL$
+ */
+
+class Error404Exception extends GeneralException
+{
+    protected $code = 404;
+    
+    protected function sendHeader()
+    {
+        if (! headers_sent()) {
+            header('HTTP/1.0 404 Not Found');
+        }
+    }
+    
+}
\ No newline at end of file
diff --git a/exception/GeneralException.php b/exception/GeneralException.php
new file mode 100644
index 0000000..9127984
--- /dev/null
+++ b/exception/GeneralException.php
@@ -0,0 +1,29 @@
+<?php
+/**
+ * @copyright NetMonsters <team@netmonsters.ru>
+ * @link http://netmonsters.ru
+ * @package Majestic
+ * @subpackage exception
+ * @since 2010-02-26
+ * @version SVN: $Id$
+ * @filesource $URL$
+ */
+
+class GeneralException extends Exception
+{
+    
+    protected $code = 500;
+    
+    protected function sendHeader()
+    {
+        if (!headers_sent()) {
+            header('HTTP/1.0 500 Internal Server Error');
+        }
+    }
+    
+    public function toHtml()
+    {
+        $this->sendHeader();
+        return 'Exception caught: ' . $this->getMessage();
+    }
+}
\ No newline at end of file
diff --git a/util/AutoloadBuilder.php b/util/AutoloadBuilder.php
index 82e0d26..894c6ee 100644
--- a/util/AutoloadBuilder.php
+++ b/util/AutoloadBuilder.php
@@ -11,6 +11,9 @@
  * @filesource $URL$
  */
 
+/**
+ * @todo Refactoring writing, locking
+ */
 class AutoloadBuilder
 {
     protected $autoload;
@@ -27,7 +30,6 @@ class AutoloadBuilder
     public function build()
     {
         $this->openAutoload();
-        echo "parsing started...\n";
         // for dublicates check
         $classes = array();
         foreach ($this->dirs as $dir) {
@@ -50,13 +52,9 @@ class AutoloadBuilder
                 
                 if (preg_match_all($this->regex, $content, $matches, PREG_SET_ORDER)) {
                     foreach ($matches as $match) {
-                        echo "found {$match[0]}...";
                         if (array_key_exists($match[2], $classes)) {
-                            echo " FAULT\n{$match[0]} also found in ".
-                            $file->getRealPath(). ", skipped.\n";
                             continue;
                         }
-                        echo " OK\n";
                         $string = "'{$match[2]}'=>'" . $relative_path . "',\n";
                         $this->write($string);
                         $classes[$match[2]] = $file->getRealPath();
@@ -64,7 +62,6 @@ class AutoloadBuilder
                 }
             }
         }
-        echo "done.\n";
         $this->closeAutoload();
     }
     
@@ -75,7 +72,7 @@ class AutoloadBuilder
     
     protected function closeAutoload()
     {
-        if ($this->write(");\n")) {
+        if ($this->write(');')) {
             fclose($this->handler);
         }
     }
@@ -84,11 +81,9 @@ class AutoloadBuilder
     {
         if (! $this->handler) {
             if (! $this->handler = fopen($this->autoload, 'w')) {
-                echo "{$this->autoload} is not writable\n";
-                die;
+                trigger_error("{$this->autoload} is not writable", E_USER_ERROR);
             }
         }
         return (bool) fwrite($this->handler, $string);
     }
-}
- 
\ No newline at end of file
+}
\ No newline at end of file