diff --git a/lib/server.js b/lib/server.js
index 8fa50f25..740572d1 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -31,6 +31,7 @@
         join                = require(DIR_SERVER + 'join'),
         ponse               = require(DIR_SERVER + 'ponse'),
         express             = require(DIR_SERVER + 'express'),
+        tryRequire          = require(DIR_SERVER + 'tryRequire'),
         
         emptyFunc           = function(req, res, next) {
             Util.exec(next);
@@ -42,20 +43,10 @@
             return emptyFunc;
         };
         
-        Console             = tryRequire('console-io') || emptyFunc;
-        
-        function tryRequire(name) {
-            var module, error;
-            
-            error = Util.exec.try(function() {
-                module = require(name);
-            });
-            
+        Console             = tryRequire('console-io', function(error) {
             if (error)
                 Util.log(error.message);
-            
-            return module;
-        }
+        }) || emptyFunc;
     
     /**
      * start server function
diff --git a/lib/server/express.js b/lib/server/express.js
index ea0d092b..c726132d 100644
--- a/lib/server/express.js
+++ b/lib/server/express.js
@@ -7,6 +7,8 @@
         Util                = require(DIR_LIB + 'util'),
         crypto              = require('crypto'),
         
+        tryRequire          = require('./tryRequire'),
+        
         express             = tryRequire('express'),
         httpAuth            = tryRequire('http-auth'),
         logger              = tryRequire('morgan'),
@@ -76,14 +78,4 @@
             callback(equal);
         });
     }
-    
-    function tryRequire(name) {
-        var module;
-        
-        Util.exec.try(function() {
-            module = require(name);
-        });
-        
-        return module;
-    }
 })();
diff --git a/lib/server/flop.js b/lib/server/flop.js
index 0cab40b4..b7f1ef4f 100644
--- a/lib/server/flop.js
+++ b/lib/server/flop.js
@@ -14,6 +14,7 @@
         readify     = require(DIR + 'readify'),
         time        = require(DIR + 'timem'),
         pipe        = require(DIR + 'pipe'),
+        tryRequire  = require(DIR + 'tryRequire'),
         
         ncp         = tryRequire('ncp'),
         rimraf      = tryRequire('rimraf'),
@@ -103,14 +104,4 @@
                 pipe.create(from, to, callback);
         });
     };
-    
-    function tryRequire(name) {
-        var module;
-        
-        Util.exec.try(function() {
-            module = require(name);
-        });
-        
-        return module;
-    }
 })();
diff --git a/lib/server/fstream.js b/lib/server/fstream.js
index 5ec3b854..ecd5c25d 100644
--- a/lib/server/fstream.js
+++ b/lib/server/fstream.js
@@ -1,8 +1,10 @@
 (function () {
     'use strict';
     
-    var DIR         = '../',
-        Util        = require(DIR + 'util'),
+    var DIR         = './',
+        
+        tryRequire  = require(DIR + 'tryRequire'),
+        
         fstream     = tryRequire('fstream'),
         tar         = tryRequire('tar');
     
@@ -23,14 +25,4 @@
         return dirStream;
     };
     
-    function tryRequire(name) {
-        var module;
-        
-        Util.exec.try(function() {
-            module = require(name);
-        });
-        
-        return module;
-    }
-    
 })();
diff --git a/lib/server/minify.js b/lib/server/minify.js
index 17ea9543..6c8a523c 100644
--- a/lib/server/minify.js
+++ b/lib/server/minify.js
@@ -1,7 +1,7 @@
 (function() {
     'use strict';
     
-    var Util                = require('../util'),
+    var tryRequire          = require('./tryRequire'),
         minify              = tryRequire('minify');
     
     module.exports          = function(name, params, callback) {
@@ -19,13 +19,4 @@
         next();
     }
     
-    function tryRequire(name) {
-        var module;
-        
-        Util.exec.try(function() {
-            module = require(name);
-        });
-        
-        return module;
-    }
 })();
diff --git a/lib/server/rest/markdown.js b/lib/server/rest/markdown.js
index e60d8ff9..92fd12b0 100644
--- a/lib/server/rest/markdown.js
+++ b/lib/server/rest/markdown.js
@@ -9,11 +9,12 @@
         
         Util        = require(DIR_LIB + 'util'),
         
-        marked      = tryRequire('marked'),
-        
+        tryRequire  = require(DIR + 'tryRequire'),
         pipe        = require(DIR + 'pipe'),
         mellow      = require(DIR + 'mellow'),
-        ponse       = require(DIR + 'ponse');
+        ponse       = require(DIR + 'ponse'),
+        
+        marked      = tryRequire('marked');
     
     exports.operate = operate;
     
@@ -64,14 +65,4 @@
         });
     }
     
-    function tryRequire(name) {
-        var module;
-        
-        Util.exec.try(function() {
-            module = require(name);
-        });
-        
-        return module;
-    }
-    
 })();
diff --git a/lib/server/socket.js b/lib/server/socket.js
index 8a1ce737..b3401390 100644
--- a/lib/server/socket.js
+++ b/lib/server/socket.js
@@ -3,6 +3,8 @@
     
     var DIR             = '../',
         Util            = require(DIR + 'util'),
+        tryRequire      = require('./tryRequire'),
+        
         io              = tryRequire('socket.io'),
         
         Socket,
@@ -67,13 +69,4 @@
         return Socket;
     }
     
-    function tryRequire(name) {
-        var module;
-        
-        Util.exec.try(function() {
-            module = require(name);
-        });
-        
-        return module;
-    }
 })();
diff --git a/lib/server/terminal.js b/lib/server/terminal.js
index 95913854..2e52b1dd 100644
--- a/lib/server/terminal.js
+++ b/lib/server/terminal.js
@@ -9,7 +9,12 @@
         Util            = require(DIR_LIB + 'util'),
         CloudFunc       = require(DIR_LIB + 'cloudfunc'),
         
-        pty             = tryRequire('pty.js'),       
+        tryRequire      = require('./tryRequire.js'),
+        
+        pty             = tryRequire('pty.js', function(error) {
+            if (error)
+                Util.log(error.message);
+        }),
         Clients         = [],
         
         CHANNEL         = CloudFunc.CHANNEL_TERMINAL,
@@ -17,18 +22,6 @@
         
         ConNum          = 0;
         
-        function tryRequire(name) {
-            var module,
-                error = Util.exec.try(function() {
-                    module = require(name);
-                });
-            
-            if (error)
-                Util.log(error.message);
-            
-            return module;
-        }
-        
     module.exports = function(io) {
         var makePty     = function(clientSocket) {
                 onConnection(clientSocket, function(channel, data) {
diff --git a/lib/server/tryRequire.js b/lib/server/tryRequire.js
new file mode 100644
index 00000000..ab57c3b5
--- /dev/null
+++ b/lib/server/tryRequire.js
@@ -0,0 +1,19 @@
+(function() {
+    'use strict';
+    
+    var Util = require('../util');
+    
+    module.exports = function(name, callback) {
+        var module,
+            isFunc  = typeof callback === 'function',
+            
+            error   = Util.exec.try(function() {
+                module = require(name);
+            });
+        
+        if (error && isFunc)
+            callback(error);
+        
+        return module;
+    };
+})();