diff --git a/base.py b/base.py
index a538e2a..47fcb50 100644
--- a/base.py
+++ b/base.py
@@ -72,8 +72,8 @@ class Extension():
         cls.buffer_size = _buffer_size
 
     @classmethod
-    def register(cls, s)
-        module_name, class_name = s.trim().split('.')[0:2]
+    def register(cls, s):
+        module_name, class_name = s.strip().split('.')[0:2]
         module_path = 'plugins.' + module_name
 
         try:
diff --git a/server.py b/server.py
index c3fbc9e..b5679c8 100644
--- a/server.py
+++ b/server.py
@@ -499,7 +499,8 @@ def start():    #Main Program
 
 if __name__== "__main__":
     # load extensions
-    map(Extension.register, use_extension.split(','))
+    for s in use_extensions.split(','):
+        Extension.register(s)
 
     # start Caterpillar
     start()
diff --git a/web.py b/web.py
index 00586be..88c0c17 100644
--- a/web.py
+++ b/web.py
@@ -94,6 +94,6 @@ if __name__ == "__main__":
     Extension.set_protocol('http')
 
     # load extensions
-    map(Extension.register, use_extension.split(','))
+    map(Extension.register, use_extensions.split(','))
 
     app.run(debug=True, host='0.0.0.0', port=listening_port)