diff --git a/src/ATBAPP/ATBDeviceControllerPlugin.cpp b/src/ATBAPP/ATBDeviceControllerPlugin.cpp
index 9f4e94e..d7d9b3d 100644
--- a/src/ATBAPP/ATBDeviceControllerPlugin.cpp
+++ b/src/ATBAPP/ATBDeviceControllerPlugin.cpp
@@ -1071,12 +1071,12 @@ PLUGIN_STATE ATBDeviceControllerPlugin::getState()
     return this->pluginState;
 }
 
-QString ATBDeviceControllerPlugin::getLastError()
+QString const &ATBDeviceControllerPlugin::getLastError()
 {
     return this->errorCode;
 }
 
-QString ATBDeviceControllerPlugin::getLastErrorDescription()
+QString const &ATBDeviceControllerPlugin::getLastErrorDescription()
 {
     return this->errorDescription;
 }
@@ -1086,8 +1086,13 @@ const QString & ATBDeviceControllerPlugin::getPluginInfo()
     return this->pluginInfo;
 }
 
+QStringList ATBDeviceControllerPlugin::getPluginInfoList() {
+   pluginInfoList.clear();
+   return pluginInfoList;
+}
 
-QString ATBDeviceControllerPlugin::getString(nsDeviceControllerInterface::RESULT_STATE resultState)
+
+QString const &ATBDeviceControllerPlugin::getString(nsDeviceControllerInterface::RESULT_STATE resultState)
 {
     QString str;