--- a/etwist/server.py	Thu Jul 08 08:54:45 2010 +0200
+++ b/etwist/server.py	Thu Jul 08 10:03:03 2010 +0200
@@ -402,6 +402,7 @@
 def run(config, vreg=None, debug=None):
     if debug is not None:
         config.debugmode = debug
+    config.check_writeable_uid_directory(config.appdatahome)
     # create the site
     root_resource = CubicWebRootResource(config, vreg=vreg)
     website = server.Site(root_resource)