diff --git a/test/test_cache.py b/test/test_cache.py
index ef4f1a3..e1cd609 100644
--- a/test/test_cache.py
+++ b/test/test_cache.py
@@ -4,7 +4,11 @@ from tiramisu import setting
 setting.expires_time = 1
 from tiramisu.option import IntOption, OptionDescription
 from tiramisu.config import Config
+from tiramisu.error import ConfigError
+
+
 from time import sleep, time
+from py.test import raises
 
 
 def make_description():
@@ -272,3 +276,6 @@ def test_force_cache():
     c.cfgimpl_get_values().force_cache()
     assert c.cfgimpl_get_values()._p_.get_cached(c) == {'u1': ([], None), 'u3': ([], None), 'u2': (None, None)}
     assert c.cfgimpl_get_settings()._p_.get_cached(c) == {'u4': (set(['disabled']), None), 'u1': (set([]), None), 'u3': (set([]), None), 'u2': (set([]), None)}
+
+    c.cfgimpl_get_settings().remove('cache')
+    raises(ConfigError, "c.cfgimpl_get_values().force_cache()")
diff --git a/tiramisu/value.py b/tiramisu/value.py
index c07ddfc..a82e1a4 100644
--- a/tiramisu/value.py
+++ b/tiramisu/value.py
@@ -420,8 +420,8 @@ class Values(object):
         """
         context = self.context()
         if not 'cache' in context.cfgimpl_get_settings():
-            raise PropertiesOptionError(_('can force cache only if cache '
-                                          'is actived in config'))
+            raise ConfigError(_('can force cache only if cache '
+                                'is actived in config'))
         #remove all cached properties and value to update "expired" time
         context.cfgimpl_reset_cache()
         for path in context.cfgimpl_get_description().impl_getpaths(