Add reason for error message
diff --git a/commons-jcs-core/src/main/java/org/apache/commons/jcs/engine/control/CompositeCacheConfigurator.java b/commons-jcs-core/src/main/java/org/apache/commons/jcs/engine/control/CompositeCacheConfigurator.java
index 938eb35..c132376 100644
--- a/commons-jcs-core/src/main/java/org/apache/commons/jcs/engine/control/CompositeCacheConfigurator.java
+++ b/commons-jcs-core/src/main/java/org/apache/commons/jcs/engine/control/CompositeCacheConfigurator.java
@@ -475,7 +475,7 @@
             }
             catch (Exception e)
             {
-                log.error( "Could not instantiate auxiliary cache named \"{0}\"", regName );
+                log.error( "Could not instantiate auxiliary cache named \"{0}\"", regName, e );
                 return null;
             }