Display the error message.

Signed-off-by: Lucas Carvalho <lucas@nexedi.com>

src/zc/buildout/networkcache.py

@@ -136,8 +136,8 @@ def download_network_cached(network_cache, path, url, logger):
                                                            network_cached_url)
             return False
     except IOError, e:
-        logger.info('Fail to download from network cache %s' % \
-                                                           network_cached_url)
+        logger.info('Fail to download from network cache %s: %s' % \
+                                                  (network_cached_url, str(e)))
         return False
 
     return True