--- a/decoupage/web.py	Mon Feb 08 11:40:57 2010 -0500
+++ b/decoupage/web.py	Mon Feb 08 11:44:20 2010 -0500
@@ -40,7 +40,9 @@
         self.directory = self.directory.rstrip(os.path.sep)
         assert os.path.isdir(self.directory)
         self.template_directories = self.template_directories.split() # no spaces in directory names, for now
-        assert sum([os.path.isdir(directory) for directory in self.template_directories]) == len(self.template_directories)
+
+        for directory in self.template_directories:
+            assert os.path.isdir(directory), "Decoupage template directory %s does not exist!" % directory
 
         # static file server
         self.fileserver = FileApp