diff --git a/MQTTSNGateway/src/MQTTSNGWProcess.cpp b/MQTTSNGateway/src/MQTTSNGWProcess.cpp
index 88ba292..2abe3a5 100644
--- a/MQTTSNGateway/src/MQTTSNGWProcess.cpp
+++ b/MQTTSNGateway/src/MQTTSNGWProcess.cpp
@@ -162,8 +162,7 @@ int Process::getParam(const char* parameter, char* value)
 
 	if ((fp = fopen(configPath.c_str(), "r")) == NULL)
 	{
-		WRITELOG("No config file:[%s]\n", configPath.c_str());
-		return -1;
+		throw Exception("No config file:[" + configPath + "]\n");
 	}
 
 	while (true)
diff --git a/MQTTSNGateway/src/mainGateway.cpp b/MQTTSNGateway/src/mainGateway.cpp
index 6fcbbc4..e196d96 100644
--- a/MQTTSNGateway/src/mainGateway.cpp
+++ b/MQTTSNGateway/src/mainGateway.cpp
@@ -1,5 +1,5 @@
 /**************************************************************************************
- * Copyright (c) 2016, Tomoaki Yamaguchi
+ * Copyright (c) 2016, 2020 Tomoaki Yamaguchi and others
  *
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
@@ -34,7 +34,12 @@ BrokerSendTask    task5(&gateway);
 
 int main(int argc, char** argv)
 {
-    gateway.initialize(argc, argv);
-    gateway.run();
+	try {
+		gateway.initialize(argc, argv);
+	    gateway.run();
+	} catch (const std::exception &ex) {
+		WRITELOG("\nEclipse Paho MQTT-SN Gateway exception: %s\n", ex.what());
+		WRITELOG("MQTT-SNGateway [-f Config file name]\n");
+	}
 	return 0;
 }