diff --git a/tiramisu/autolib.py b/tiramisu/autolib.py
index aa563fc..1295758 100644
--- a/tiramisu/autolib.py
+++ b/tiramisu/autolib.py
@@ -279,9 +279,7 @@ async def manager_callback(callbk: Param,
         except ValueError as err:
             raise ValueError(_('the option "{0}" is used in a calculation but is invalid ({1})').format(option_bag.option.impl_get_display_name(), err))
         except AttributeError as err:
-            raise ConfigError(_('impossible to calculate "{0}", {1}').format(option_bag.option.impl_get_display_name(),
-                                                                             err,
-                                                                             ))
+            raise ConfigError(_(f'unable to get value for calculating "{option_bag.option.impl_get_display_name()}", {err}'))
         return value
 
     async def get_option_bag(config_bag,
diff --git a/tiramisu/config.py b/tiramisu/config.py
index 09476e7..85000dc 100644
--- a/tiramisu/config.py
+++ b/tiramisu/config.py
@@ -106,7 +106,6 @@ class SubConfig:
                                      desc,
                                      resetted_opts,
                                      option_bag):
-
         if option_bag.path in resetted_opts:
             return
         resetted_opts.append(option_bag.path)
@@ -185,16 +184,13 @@ class SubConfig:
         context = self.cfgimpl_get_context()
         desc = context.cfgimpl_get_description()
         if option_bag is not None:
-            if 'cache' in option_bag.config_bag.properties:
-                has_cache = True
-                option_bag.config_bag.properties = option_bag.config_bag.properties - {'cache'}
-            else:
-                has_cache = False
+            if 'cache' not in option_bag.config_bag.properties:
+                return
+            option_bag.config_bag.properties = option_bag.config_bag.properties - {'cache'}
             await self.reset_one_option_cache(desc,
                                               resetted_opts,
                                               option_bag)
-            if has_cache:
-                option_bag.config_bag.properties = option_bag.config_bag.properties | {'cache'}
+            option_bag.config_bag.properties = option_bag.config_bag.properties | {'cache'}
         else:
             context._impl_values_cache.reset_all_cache()
             context._impl_properties_cache.reset_all_cache()
diff --git a/tiramisu/option/syndynoptiondescription.py b/tiramisu/option/syndynoptiondescription.py
index 408bcec..3d183f7 100644
--- a/tiramisu/option/syndynoptiondescription.py
+++ b/tiramisu/option/syndynoptiondescription.py
@@ -119,7 +119,7 @@ class SynDynOptionDescription:
         return rootpath + self.impl_getname()
 
     def impl_get_display_name(self) -> str:
-        return self.opt.impl_get_display_name() + self._suffix
+        return self.opt.impl_get_display_name() + str(self._suffix)
 
 
 class SynDynLeadership(SynDynOptionDescription):