diff --git a/server/jail.py b/server/jail.py
index 8e249bff..53048b98 100644
--- a/server/jail.py
+++ b/server/jail.py
@@ -49,8 +49,10 @@ class Jail:
 		if backend != 'auto':
 			# we have got strict specification of the backend to use
 			if not (backend in self._BACKENDS):
+				logSys.error("Unknown backend %s. Must be among %s or 'auto'"
+					% (backend, backends))
 				raise ValueError("Unknown backend %s. Must be among %s or 'auto'"
-								 % (backend, backends))
+					% (backend, backends))
 			# so explore starting from it till the 'end'
 			backends = backends[backends.index(backend):]
 
@@ -68,8 +70,11 @@ class Jail:
 			except ImportError, e:
 				logSys.debug(
 					"Backend %r failed to initialize due to %s" % (b, e))
+		# log error since runtime error message isn't printed, INVALID COMMAND
+		logSys.error(
+			"Failed to initialize any backend for Jail %r" % self.__name)
 		raise RuntimeError(
-			"We should have initialized at least 'polling' backend")
+			"Failed to initialize any backend for Jail %r" % self.__name)
 
 
 	def _initPolling(self):