diff --git a/gurux.dlms.simulator.java/src/gurux/dlms/simulator/Settings.java b/gurux.dlms.simulator.java/src/gurux/dlms/simulator/Settings.java
index dccd96b4..90106ce9 100644
--- a/gurux.dlms.simulator.java/src/gurux/dlms/simulator/Settings.java
+++ b/gurux.dlms.simulator.java/src/gurux/dlms/simulator/Settings.java
@@ -172,7 +172,7 @@ else if ("Off".compareTo(it.getValue()) == 0)
                     settings.trace = TraceLevel.OFF;
                 else
                     throw new IllegalArgumentException(
-                            "Invalid Authentication option '" + it.getValue()
+                            "Invalid Trace level option '" + it.getValue()
                                     + "'. (Error, Warning, Info, Verbose, Off).");
                 break;
             case 'p':
@@ -375,4 +375,4 @@ else if ("Off".compareTo(it.getValue()) == 0)
         }
         return 0;
     }
-}
\ No newline at end of file
+}