Add the default controller to redirect the main url toward the plugin.

controllers/default.py

+""" $Id$ """
+
+
+def index():
+	"""Main Controller to run the application.
+
+	"""
+	url = URL(request.application,
+			  'plugin_dbui',
+			  'index',
+			  vars=request.vars)
+
+	redirect(url)